Revert "scsi: ufs: core: Add OPP support for scaling clocks and regulators"

This reverts commit 847af89a which is
commit 930bd77e upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: If1498686628b8d9a8c29f15d7c51dfa2f0cb2db5
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>