mfd: fix sm501 section mismatches

drv => driver renaming is needed otherwise modpost will spit false positives
re pointing to __devinit function from regular data.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>