Revert "soc/mediatek: mtk-devapc: Convert to platform remove callback returning void"

This reverts commit c3fa28e6 which is
commit a129ac35 upstream.

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

Bug: 161946584
Change-Id: I446982f33cf2304e818ff2bcb9daad79f30d202a
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>