power/max8997_charger.c uses interfaces from linux/module.h,
so it should include that file.  This fixes build errors.
Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Acked-by: NMyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: NAnton Vorontsov <cbouatmailru@gmail.com>