airoha: an7583: enable UBI NVMEM and FIT block configs

Enable CONFIG_MTD_UBI_NVMEM and CONFIG_UIMAGE_FIT_BLK in the Linux 6.18
kernel configuration for the an7583 target to add support for NVMEM cells
on UBI volumes and block-backed UIMAGE FIT parsing. This is required for
upcoming Nokia XG-040G-MF (UBI) support.

Signed-off-by: Mikhail Zhilkin <csharper2005@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/24654
Signed-off-by: Robert Marko <robimarko@gmail.com>

target/linux/airoha/an7583/config-6.18

@@ -221,6 +221,7 @@ CONFIG_MTD_SPLIT_FIT_FW=y
 CONFIG_MTD_UBI=y
 CONFIG_MTD_UBI_BEB_LIMIT=20
 CONFIG_MTD_UBI_BLOCK=y
+CONFIG_MTD_UBI_NVMEM=y
 CONFIG_MTD_UBI_WL_THRESHOLD=4096
 CONFIG_MTD_VIRT_CONCAT=y
 CONFIG_MTK_NET_PHYLIB=y
@@ -367,6 +368,7 @@ CONFIG_TRACE_IRQFLAGS_NMI_SUPPORT=y
 CONFIG_TREE_RCU=y
 CONFIG_TREE_SRCU=y
 CONFIG_UBIFS_FS=y
+CONFIG_UIMAGE_FIT_BLK=y
 # CONFIG_UNMAP_KERNEL_AT_EL0 is not set
 CONFIG_USB=y
 CONFIG_USB_COMMON=y