ath79: fix initramfs boot for Huawei AP5030DN and AP6010DN

Fix execution of initramfs image on Huawei AP5030DN and AP6010DN by
increasing available memory for LZMA extraction by the loader.

The default leaves only ~23.6 MB between the decompression target
and the running loader code. Extracting images with built-in
packages lead to overwriting the loader code. This causes
the decompression to produce garbage output and hang.

Fix this by overwriting LZMA_TEXT_START to increase the
available memory for LZMA extraction to ~39.6 MB.

Signed-off-by: Marco von Rosenberg <marcovr@selfnet.de>
Link: openwrt#22581
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

Author: CodingMarco

target/linux/ath79/image/generic.mk

@@ -1836,6 +1836,7 @@ define Device/huawei_ap5030dn
   DEVICE_PACKAGES := ath10k-firmware-qca988x-ct kmod-ath10k-ct
   LOADER_TYPE := bin
   LOADER_FLASH_OFFS := 0x111DC0
+  LZMA_TEXT_START := 0x82800000
   KERNEL_SIZE := 15360k
   IMAGE_SIZE := 30720k
   COMPILE := loader-$(1).bin
@@ -1851,6 +1852,7 @@ define Device/huawei_ap6010dn
   DEVICE_MODEL := AP6010DN
   LOADER_TYPE := bin
   LOADER_FLASH_OFFS := 0x111DC0
+  LZMA_TEXT_START := 0x82800000
   KERNEL_SIZE := 15360k
   IMAGE_SIZE := 30720k
   COMPILE := loader-$(1).bin