mfd: Add MAX77663 mfd driver

Add mfd core driver for Maxim PMU MAX77663.

Bug 849360
Bug 854414

Original-Change-Id: I6699540fd7d0f7b428a1be64cf06f7cd65b5b32e
Signed-off-by: Jin Park <jinyoungp@nvidia.com>
Reviewed-on: http://git-master/r/41503
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>

Rebase-Id: Rc0f0a67db8b7d554bada7dd6b3e103ab30b374d4
4 files changed