Add regmap backed for MSM CCI subsystem

Fairphone's lm3644 flash driver is connected via the CCI's
I2C bus. The CCI however is not exposing its I2C functionality
using Linux' I2C system. Luckily, the lm3644 driver uses regmap
so it should enough to offer a regmap interface.

FPIIM-778

Change-Id: I88ce612559c86538bda3f362f8afbf6aa571d2d6
3 files changed