Revert "FROMLIST: irqchip: irq-meson-gpio: make it possible to build as a module"

This reverts commit 95d54354.

It is already included in 5.16-rc1 in a different form, so revert it
here to prevent merge issues from showing up later on, and to make it
obvious that we are taking the upstream version, not the different
version that was in the android-mainline tree.

Bug: 179406580
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I44f1ec90c26f28d8e921749fab2afbfecead6898