configs/imx6-sabreauto: bump U-Boot and kernel

Bump U-Boot to 2021.10 and kernel to 5.15.1 version.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/imx6-sabreauto_defconfig

@@ -4,8 +4,8 @@ BR2_ARM_ENABLE_NEON=y
 BR2_ARM_ENABLE_VFP=y
 BR2_ARM_FPU_VFPV3=y
 
-# Linux headers same as kernel, a 5.3 series
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_3=y
+# Linux headers same as kernel, a 5.15 series
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_15=y
 
 # System
 BR2_TARGET_GENERIC_GETTY_PORT="ttymxc3"
@@ -24,7 +24,7 @@ BR2_TARGET_ROOTFS_EXT2_4=y
 BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_BOARDNAME="mx6sabreauto"
 BR2_TARGET_UBOOT_CUSTOM_VERSION=y
-BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2019.10"
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2021.10"
 BR2_TARGET_UBOOT_NEEDS_LZOP=y
 BR2_TARGET_UBOOT_FORMAT_IMG=y
 BR2_TARGET_UBOOT_SPL=y
@@ -33,7 +33,7 @@ BR2_TARGET_UBOOT_SPL_NAME="SPL"
 # Kernel
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.3.4"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.15.1"
 BR2_LINUX_KERNEL_DEFCONFIG="imx_v6_v7"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx6q-sabreauto imx6dl-sabreauto imx6qp-sabreauto"