regulator: max77686: Make max77686_enable() static.

This patch fixes a sparse warning. Since max77686_enable() is a callback,so it
should be static.

Signed-off-by: Yadwinder Singh Brar <yadi.brar@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
1 file changed