Revert "regmap: Ensure range selector registers are updated after cache sync"

This reverts commit 164fa9a0.

The reverted commit breaks at least some I2C-based soundcards, and
possibly much more. Thanks for pointing the finger, HiassofT.

See: https://github.com/raspberrypi/linux/issues/5763


Signed-off-by: Phil Elwell <phil@raspberrypi.com>