ASoC: wcd9304:Fix RX voice in handset call distort after reboot the device

Issue:The RX voice in handset call will distorted from handset after
      reboot the device
Root cause:This happens due enable override gain in cp_static register.

Fix:Configure the cp_static override gain as Half gain.

Change-Id: I9addb8650fad5a1169bf1afb8e63f1eac4163514
CRs-Fixed: 532155
Signed-off-by: Satish Kamuju <skamuj@codeaurora.org>
Merge "ASoC: wcd9304:Fix RX voice in handset call distort after reboot the device"