configs/stm32mp157c_dk2: bump Linux to 5.4.26

Signed-off-by: Bartosz Bilas <b.bilas@grinn-global.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/stm32mp157c_dk2_defconfig

@@ -6,7 +6,7 @@ BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
 BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/stmicroelectronics/common/stm32mp157/genimage.cfg"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.4.7"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.4.26"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
 BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/stmicroelectronics/stm32mp157c-dk2/linux.config"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y