configs/avenger96_defconfig: bump Linux version to 6.6.22 LTS

This patch upgrades Kernel version to 6.6.22 LTS on avenger96 board.
Beside that, In accordance with the kernel 6.5rc1 commit
724ba6751532 ("ARM: dts: Move .dts files to vendor sub-directories")
the device tree path also has been modified to point the device tree in
the proper location.

As another change, due to commit 3108eb2e8aa7
("mmc: mmci: Set PROBE_PREFER_ASYNCHRONOUS"), the order of SD card and
eMMC probing has swapped. The SD card is now mmcblk0 instead of
mmcblk1. Thus, the default root append (mmcblk1p4) in 'extlinux.conf'
file in the overlay directory of the board is changed, otherwise the
rootfs was not possible to be detected.

Signed-off-by: Javad Rahimipetroudi <javad.rahimipetroudi@mind.be>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

board/arrow/avenger96/overlay/boot/extlinux/extlinux.conf

@@ -1,4 +1,4 @@
 label stm32mp157c-dk2-buildroot
   kernel /boot/zImage
   devicetree /boot/stm32mp157a-dhcor-avenger96.dtb
-  append root=/dev/mmcblk1p4 rootwait
+  append root=/dev/mmcblk0p4 rootwait

configs/avenger96_defconfig

@@ -3,7 +3,7 @@ BR2_arm=y
 BR2_cortex_a7=y
 
 # Linux headers same as kernel, a 5.8 series
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_8=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_6=y
 
 # System configuration
 BR2_GLOBAL_PATCH_DIR="board/arrow/avenger96/patches"
@@ -13,10 +13,10 @@ BR2_ROOTFS_POST_IMAGE_SCRIPT="board/stmicroelectronics/common/stm32mp157/post-im
 # Kernel
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.8.13"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.6.22"
 BR2_LINUX_KERNEL_DEFCONFIG="multi_v7"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
-BR2_LINUX_KERNEL_INTREE_DTS_NAME="stm32mp157a-dhcor-avenger96"
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="st/stm32mp157a-dhcor-avenger96"
 BR2_LINUX_KERNEL_INSTALL_TARGET=y
 BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y