qualcommax: move Device DTS to dedicated DTS directory

Align the qualcommax target to the pattern already used on other devices where
the device DTS are placed in a dedicated directory separate from the files
directory.

This, while trying to enforce a common pattern for every target, also permits to
do modification to device DTS without having to trigger a recompilation of the
entire kernel (as the files directory is not touched)

Link: https://github.com/openwrt/openwrt/pull/22037
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

target/linux/qualcommax/image/Makefile

@@ -6,7 +6,7 @@ define Device/Default
 	KERNEL_LOADADDR := 0x41000000
 	DEVICE_DTS = $$(SOC)-$(lastword $(subst _, ,$(1)))
 	DEVICE_DTS_CONFIG := config@1
-	DEVICE_DTS_DIR := $(DTS_DIR)/qcom
+	DEVICE_DTS_DIR := ../dts
 	IMAGES := sysupgrade.bin
 	IMAGE/sysupgrade.bin = sysupgrade-tar | append-metadata
 	IMAGE/sysupgrade.bin/squashfs :=

target/linux/qualcommax/image/ipq50xx.mk

@@ -1,3 +1,4 @@
+DTS_DIR := $(DTS_DIR)/qcom
 DEVICE_VARS += BOOT_SCRIPT
 
 define Build/mstc-header

target/linux/qualcommax/image/ipq60xx.mk

@@ -1,3 +1,4 @@
+DTS_DIR := $(DTS_DIR)/qcom
 DEVICE_VARS += TPLINK_SUPPORT_STRING
 
 define Build/wax610-netgear-tar

target/linux/qualcommax/image/ipq807x.mk

@@ -1,3 +1,4 @@
+DTS_DIR := $(DTS_DIR)/qcom
 DEVICE_VARS += NETGEAR_BOARD_ID NETGEAR_HW_ID TPLINK_SUPPORT_STRING ZYXEL_MODEL_ID
 
 define Build/asus-fake-ramdisk