Revert "debugfs: regset32: Add Runtime PM support"

This reverts commit 3c5a2865 which is
commit 30332eee upstream.

It breaks the Android kernel abi, so revert it.  If it needs to come
back later, it can do so in an abi-safe way.

Bug: 161946584
Change-Id: I9a87a813cec243ca673a496b106464a0faa47523
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>