ARM: SAMSUNG: Constify array of wake irqs passed to samsung_sync_wakemask

The samsung_sync_wakemask() iterates over passed array of wake irqs but
does not modify it.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>