[MTD] Fix !CONFIG_BLOCK compile for mtdsuper.c

[MTD] Fix !CONFIG_BLOCK compile for mtdsuper.c

As reported by Adrian Bunk, commit d8e0acd3af4e4bc544e9c427111eb197e6bdb1b0
(switch mtd and dm-table to lookup_bdev()) causes the following compile
error with CONFIG_BLOCK=n:

  CC      drivers/mtd/mtdsuper.o
drivers/mtd/mtdsuper.c: In function `get_sb_mtd':
drivers/mtd/mtdsuper.c:184: error: implicit declaration of function 'lookup_bdev'
drivers/mtd/mtdsuper.c:184: warning: assignment makes pointer from integer without a cast
drivers/mtd/mtdsuper.c:197: error: implicit declaration of function 'bdput'
make[3]: *** [drivers/mtd/mtdsuper.o] Error 1

Fix it by putting the block device lookup inside #ifdef CONFIG_BLOCK

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>