Revert "irqchip/imx-irqsteer: Add runtime PM support"

This reverts commit 294aa15e which is
commit 4730d2233311d86cad9dc510318d1b40e4b53cf2 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: I83042b752bcb6a1036e29033e836ea4adfb150aa
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>