kernel: Make the patches apply on top of 4.19

This makes the patches which were just copied in the previous commit
apply on top of kernel 4.19.

The patches in the backports-4.19 folder were checked if they are really
in kernel 4.19 based on the title and only removed if they were found in
the upstream kernel.

The following additional patches form the pending folder went into
upstream Linux 4.19:
pending-4.19/171-usb-dwc2-Fix-inefficient-copy-of-unaligned-buffers.patch
pending-4.19/190-2-5-e1000e-Fix-wrong-comment-related-to-link-detection.patch
pending-4.19/478-mtd-spi-nor-Add-support-for-XM25QH64A-and-XM25QH128A.patch
pending-4.19/479-mtd-spi-nor-add-eon-en25qh32.patch
pending-4.19/950-tty-serial-exar-generalize-rs485-setup.patch
pending-4.19/340-MIPS-mm-remove-mips_dma_mapping_error.patch

Bigger changes were introduced to the m25p80 spi nor driver, as far as I
saw it in the new code, it now has the functionality provided in this
patch:
pending-4.19/450-mtd-m25p80-allow-fallback-from-spi_flash_read-to-reg.patch

Part of this patch went upstream independent of OpenWrt:
hack-4.19/220-gc_sections.patch
This patch was reworked to match the changes done upstream.

The MIPS DMA API changed a lot, this patch was rewritten to match the
new DMA handling:
pending-4.19/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch

I did bigger manual changes to the following patches and I am not 100% sure if they are all correct:
pending-4.19/0931-w1-gpio-fix-problem-with-platfom-data-in-w1-gpio.patch
pending-4.19/411-mtd-partial_eraseblock_write.patch
pending-4.19/600-netfilter_conntrack_flush.patch
pending-4.19/611-netfilter_match_bypass_default_table.patch
pending-4.19/670-ipv6-allow-rejecting-with-source-address-failed-policy.patch
hack-4.19/211-host_tools_portability.patch
hack-4.19/221-module_exports.patch
hack-4.19/321-powerpc_crtsavres_prereq.patch
hack-4.19/902-debloat_proc.patch

This is based on patchset from Marko Ratkaj <marko.ratkaj@sartura.hr>

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/generic/hack-4.19/251-sound_kconfig.patch

@@ -63,17 +63,17 @@ Signed-off-by: John Crispin <john@phrozen.org>
  
 --- a/drivers/bcma/Kconfig
 +++ b/drivers/bcma/Kconfig
-@@ -15,6 +15,7 @@ menuconfig BCMA
+@@ -16,6 +16,7 @@ if BCMA
+ # Support for Block-I/O. SELECT this from the driver that needs it.
  config BCMA_BLOCKIO
  	bool
- 	depends on BCMA
 +	default y
  
  config BCMA_HOST_PCI_POSSIBLE
  	bool
 --- a/drivers/ssb/Kconfig
 +++ b/drivers/ssb/Kconfig
-@@ -29,6 +29,7 @@ config SSB_SPROM
+@@ -28,6 +28,7 @@ config SSB_SPROM
  config SSB_BLOCKIO
  	bool
  	depends on SSB
@@ -81,7 +81,7 @@ Signed-off-by: John Crispin <john@phrozen.org>
  
  config SSB_PCIHOST_POSSIBLE
  	bool
-@@ -49,7 +50,7 @@ config SSB_PCIHOST
+@@ -48,7 +49,7 @@ config SSB_PCIHOST
  config SSB_B43_PCI_BRIDGE
  	bool
  	depends on SSB_PCIHOST
@@ -92,12 +92,12 @@ Signed-off-by: John Crispin <john@phrozen.org>
  	bool
 --- a/lib/Kconfig
 +++ b/lib/Kconfig
-@@ -358,16 +358,16 @@ config BCH_CONST_T
+@@ -377,16 +377,16 @@ config BCH_CONST_T
  # Textsearch support is select'ed if needed
  #
  config TEXTSEARCH
 -	bool
-+	boolean	"Textsearch support"
++	bool "Textsearch support"
  
  config TEXTSEARCH_KMP
 -	tristate
@@ -146,8 +146,8 @@ Signed-off-by: John Crispin <john@phrozen.org>
  
  config CFG80211
  	tristate "cfg80211 - wireless configuration API"
-@@ -188,7 +188,7 @@ config CFG80211_WEXT_EXPORT
- 	  wext compatibility symbols to be exported.
+@@ -202,7 +202,7 @@ config CFG80211_WEXT_EXPORT
+ endif # CFG80211
  
  config LIB80211
 -	tristate
@@ -155,7 +155,7 @@ Signed-off-by: John Crispin <john@phrozen.org>
  	default n
  	help
  	  This options enables a library of common routines used
-@@ -197,13 +197,16 @@ config LIB80211
+@@ -211,13 +211,16 @@ config LIB80211
  	  Drivers should select this themselves if needed.
  
  config LIB80211_CRYPT_WEP