power: Drop unused muic_max77693 driver and mfd code

This driver is not used and has lain unconverted since:

   fc47cf9d054 arm: exynos: i2c: Convert exynos boards to use DM_I2C

Drop it and the entire mfd directory, since there is nothing left.

Signed-off-by: Simon Glass <sjg@chromium.org>
3 files changed