ASoC: codec: remove power_on control from client

For audio playback over hdmi, audio hdmi codec
is client to DBA and not supposed to call power_on
API. Remove the power_on calls to avoid display
issue during suspend.

CRs-Fixed: 973918
Change-Id: I584072c758ddf25deb34b82ba0c6e13cb3087c2a
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>