configs/rock5b: update to linux 6.12.4

Update to Linux 6.12, which also happens to be a LTS release.

Signed-off-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Julien Olivain <ju.o@free.fr>

board/radxa/rock5b/patches/linux/linux.hash

@@ -1,2 +1,2 @@
 # From https://www.kernel.org/pub/linux/kernel/v6.x/sha256sums.asc
-sha256  057263d0afc17d5253794afd3d239ba4da4aa734b22fa36c1665f41b95449b73  linux-6.11.3.tar.xz
+sha256  6f35f821433d8421be7167990747c7c4a0c451958fb96883446301af13d71152  linux-6.12.4.tar.xz

configs/rock5b_defconfig

@@ -1,6 +1,6 @@
 BR2_aarch64=y
 BR2_cortex_a76_a55=y
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_11=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_12=y
 BR2_GLOBAL_PATCH_DIR="board/radxa/rock5b/patches"
 BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
 BR2_TARGET_GENERIC_HOSTNAME="rock5b"
@@ -12,7 +12,7 @@ BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
 BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/radxa/rock5b/genimage.cfg"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.11.3"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.12.4"
 BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
 BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/radxa/rock5b/linux.fragment"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y