ASoC: wcd: set analog gain mode to manual when compander is off

If compander DRE isn't turned on, ensure analog gain mode
is set to manual mode. This also resolves low volume
at one channel.

CRs-Fixed: 2102126
Change-Id: Id29b7055fe4f7fa7b3853c26770df38d10539d8c
Signed-off-by: Vatsal Bucha <vbucha@codeaurora.org>