iopsys-econet: Add loopdev and mtd_cmd to kernel

Add loopdev and mtd command parser to kernel.

Signed-off-by: Bartlomiej Grzeskowiak <bartlomiej.grzeskowiak@iopsys.eu>

iopsys-econet/en7562/config-5.4

@@ -76,6 +76,8 @@ CONFIG_BLK_DEV_RAM=y
 CONFIG_BLK_DEV_RAM_COUNT=16
 CONFIG_BLK_DEV_RAM_SIZE=4096
 CONFIG_BLK_DEV_SD=m
+CONFIG_BLK_DEV_LOOP=y
+CONFIG_BLK_DEV_LOOP_MIN_COUNT=8
 CONFIG_BLK_MQ_PCI=y
 CONFIG_BLK_PM=y
 CONFIG_BLK_SCSI_REQUEST=y
@@ -429,6 +431,7 @@ CONFIG_MTD_UBI=y
 CONFIG_MTD_UBI_BEB_LIMIT=20
 # CONFIG_MTD_UBI_BLOCK is not set
 CONFIG_MTD_UBI_WL_THRESHOLD=4096
+CONFIG_MTD_CMDLINE_PARTS=y
 CONFIG_MUTEX_SPIN_ON_OWNER=y
 CONFIG_NAMESPACES=y
 CONFIG_NEED_DMA_MAP_STATE=y