ASoC: ak4642: fixup snd_soc_update_bits mask for PW_MGMT2

[ upstream commit bd7fdbca ]

mask didn't cover update-data

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@kernel.org
Signed-off-by: Andi Kleen <ak@linux.intel.com>