ipq807x: rename target to qualcommax

Currently, ipq807x only covers Qualcomm IPQ807x SoC-s.
However, Qualcomm also has IPQ60xx and IPQ50xx SoC-s under the AX WiSoC-s
and they share a lot of stuff with IPQ807x, especially IPQ60xx so to avoid
duplicating kernel patches and everything lets make a common target with
per SoC subtargets.

Start doing that by renaming ipq807x to qualcommax so that dependencies
on ipq807x target can be updated.

Signed-off-by: Robert Marko <robimarko@gmail.com>

target/linux/qualcommax/Makefile

@@ -1,8 +1,8 @@
 include $(TOPDIR)/rules.mk
 
 ARCH:=aarch64
-BOARD:=ipq807x
-BOARDNAME:=Qualcomm Atheros IPQ807x
+BOARD:=qualcommax
+BOARDNAME:=Qualcomm Atheros 802.11ax WiSoC-s
 FEATURES:=squashfs ramdisk fpu nand rtc emmc
 KERNELNAME:=Image dtbs
 CPU_TYPE:=cortex-a53