mfd: S5M series initial release

Samsung is developing various multi function devices. Currently, 3 devices are announced by samsung. S5M8767 has pmic and rtc and battery charger.
S5M8763 has pmic, rtc, Li-ion battery charger
S5M8751 has pmic, codec, battery charger, backlight controller. All devices are designed for mobile applications. Sequentially, All driver will be posted.
This is initial version for MFD of S5M series.
The other driver will be submitted separately.

Sangbeom

*Currently, My git server has some problem.
So, I can't use git send-email.
This patch are sent by outlook.