hal: Change volume control for HFP in Dual ASM loopback

When using ASM loopack in RX path, the volume must be applied in
ASM rather than AFE loopback.

Change-Id: Ifa16cf91d727304a7bbd8d25734a61660851a843
Signed-off-by: Roberto Granados Dorado <robertog@codeaurora.org>