lantiq: add support for AVM FRITZ!Box 7362 SL

Hardware:
- SoC: Lantiq VRX288
- RAM: Winbond W971GG6JB 1 Gb (128 MiB)
- Flash:
  - SPI: 8 Mb (1 MiB) for bootloader and tffs
  - NAND: 1 Gb (128 MiB) for OS
- xDSL: Lantiq VRX208
- WLAN: Atheros AR9381
- DECT: Dialog Semiconductors SC14441

Everything except FXS/DECT works
(no drivers for AVM's FXS implementation with SC14441).

Installation via FTP:
1. Use scripts/flashing/eva_ramboot.py to send initramfs-kernel.bin
to the device when powering on.
Standard AVM procedures with finding the correct IP address and
the right moment to open FTP apply here (approx. 4 seconds on 7362SL).
IMPORTANT: set lzma compression in ramdisk options, bootloader stalls
when receiving uncompressed images.

2. Transfer sysupgrade.bin image with scp to /tmp directory
and run sysupgrade

3. First boot might take a bit longer if linux_fs_start was set to 1,
in that case the device will reboot twice, first time it will fail to load
second kernel (overwritten by ubifs), set linux_fs_start to 0 and reboot.

OpenWrt uses the entire NAND flash. Kernel uses 4 MiB and rootfs uses
the rest of 124 MiB, overwriting everything related to FRITZ!OS - both
OS images, config and answering machine/media server data.
To return to FRITZ!OS, use AVM's recovery image.

Signed-off-by: Danijel Tudek <danijel.tudek@gmail.com>

target/linux/lantiq/base-files/etc/board.d/02_network

@@ -158,6 +158,14 @@ avm,fritz7360sl)
 		"0:lan:3" "1:lan:4" "2:lan:2" "4:lan:1" "6t@eth0"
 	;;
 
+avm,fritz7362sl)
+	annex="b"
+	lan_mac=$(fritz_tffs -n maca -i $(find_mtd_part "tffs (1)"))
+	wan_mac=$(fritz_tffs -n macdsl -i $(find_mtd_part "tffs (1)"))
+	ucidef_add_switch "switch0" \
+		"0:lan:3" "1:lan:4" "2:lan:2" "4:lan:1" "6t@eth0"
+	;;
+
 avm,fritz7412)
 	tffsdev=$(find_mtd_chardev "nand-tffs")
 	annex="b"

target/linux/lantiq/base-files/etc/hotplug.d/firmware/12-ath9k-eeprom

@@ -157,7 +157,8 @@ case "$FIRMWARE" in
 				ath9k_patch_fw_mac_crc $(macaddr_add $(mtd_get_mac_ascii uboot-env ethaddr) +2) 524
 				;;
 			avm,fritz3370-rev2-hynix|\
-			avm,fritz3370-rev2-micron)
+			avm,fritz3370-rev2-micron|\
+			avm,fritz7362sl)
 				ath9k_eeprom_extract_reverse "urlader" 5441 1088
 				;;
 			avm,fritz7312|avm,fritz7320|avm,fritz7360sl)

target/linux/lantiq/base-files/lib/upgrade/platform.sh

@@ -11,6 +11,7 @@ platform_do_upgrade() {
 	case "$board" in
 	avm,fritz3370-rev2-hynix|\
 	avm,fritz3370-rev2-micron|\
+	avm,fritz7362sl|\
 	avm,fritz7412|\
 	bt,homehub-v2b|\
 	bt,homehub-v3a|\