asoc: codecs: function definition should match prototype

asoc: codecs:  function definition should match prototype

/nvidia/DEV_KERNEL/kernel/sound/soc/codecs/rt5639.c:2426:2:
warning: initialization from incompatible pointer type [enabled by default]
/nvidia/DEV_KERNEL/kernel/sound/soc/codecs/rt5639.c:2426:2:
warning: (near initialization for 'soc_codec_dev_rt5639.suspend') [enabled by default]

Change-Id: I77c3f801b00c186673ebe5870cb2c074f7404bf5
Signed-off-by: Philip Rakity <prakity@nvidia.com>
Reviewed-on: http://git-master/r/278878
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
(cherry picked from commit 2e4dc9c352517881e1f6aceaba845c7c4b407387)
Signed-off-by: Ajay Nandakumar <anandakumarm@nvidia.com>