kernel: add CONFIG_INITRAMFS_PRESERVE_MTIME config to Initramfs function

New kernel version 6.1 introduced new INITRAMFS option. Add them to the
Initramfs functions to correctly compile initramfs images.

Signed-off-by: Christian Marangi <[email protected]>

include/kernel-defaults.mk

@@ -75,6 +75,7 @@ endif
 	rm -f $(LINUX_DIR)/.config.prev
 	mv $(LINUX_DIR)/.config $(LINUX_DIR)/.config.old
 	$(call Kernel/SetInitramfs/PreConfigure)
+	echo "# CONFIG_INITRAMFS_PRESERVE_MTIME is not set" >> $(LINUX_DIR)/.config
   ifneq ($(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE),y)
 	echo 'CONFIG_INITRAMFS_ROOT_UID=$(shell id -u)' >> $(LINUX_DIR)/.config
 	echo 'CONFIG_INITRAMFS_ROOT_GID=$(shell id -g)' >> $(LINUX_DIR)/.config
@@ -99,6 +100,7 @@ define Kernel/SetNoInitramfs
 	grep -v INITRAMFS $(LINUX_DIR)/.config.old > $(LINUX_DIR)/.config.set
 	echo 'CONFIG_INITRAMFS_SOURCE=""' >> $(LINUX_DIR)/.config.set
 	echo '# CONFIG_INITRAMFS_FORCE is not set' >> $(LINUX_DIR)/.config.set
+	echo "# CONFIG_INITRAMFS_PRESERVE_MTIME is not set" >> $(LINUX_DIR)/.config.set
 endef
 
 define Kernel/Configure/Default