[MTD] core: Clean up trailing white spaces

drivers/mtd/Kconfig

drivers/mtd/afs.c

drivers/mtd/cmdlinepart.c

drivers/mtd/ftl.c

drivers/mtd/inftlcore.c

drivers/mtd/inftlmount.c

drivers/mtd/mtd_blkdevs.c

drivers/mtd/mtdblock.c

drivers/mtd/mtdchar.c

drivers/mtd/mtdconcat.c

drivers/mtd/mtdcore.c

drivers/mtd/mtdpart.c

drivers/mtd/nftlcore.c

drivers/mtd/nftlmount.c

drivers/mtd/redboot.c

drivers/mtd/rfd_ftl.c