physmap_flash_remove releases only last memory region.  This causes
memory leak if multiple resources were provided.

This patch fixes this leakage by using devm_ functions.
Signed-off-by: NAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>