ASoC: sdm660_cdc: Set speaker amplifier enable bit

During playback on speaker mute is observed if spk
amplifier is not enabled. Enable speaker amplifier
when SPK PA is enabled.

CRs-Fixed: 2374703
Change-Id: I932d78afc58051b42a21ee77b394a13f111e68c6
Signed-off-by: Soumya Managoli <smanag@codeaurora.org>