configs/imx28evk: bump U-Boot and kernel versions

Bump U-Boot to 2024.04 and kernel to 6.6.26 versions.

The Kernel DTS name is also updated, to follow
the reorganization in [1], first included in v6.5.

Fixes: [2]

[1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=724ba6751532055db75992fc6ae21c3e322e94a7
[2] https://gitlab.com/buildroot.org/buildroot/-/jobs/6544501164

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/freescale_imx28evk_defconfig

@@ -2,8 +2,8 @@
 BR2_arm=y
 BR2_arm926t=y
 
-# Linux headers same as kernel, a 5.4 series
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_4=y
+# Linux headers same as kernel, a 6.6 series
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_6=y
 
 # system
 BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
@@ -11,16 +11,16 @@ BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
 # kernel
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.4.42"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.6.26"
 BR2_LINUX_KERNEL_DEFCONFIG="mxs"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
-BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx28-evk"
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="nxp/mxs/imx28-evk"
 
 # bootloader
 BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_BOARDNAME="mx28evk"
 BR2_TARGET_UBOOT_CUSTOM_VERSION=y
-BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2020.04"
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2024.04"
 BR2_TARGET_UBOOT_FORMAT_SD=y
 
 # Filesystem