configs: msmcobalt: Update SLIMBUS_8_TX loopback volume

Initialize SLIMBUS_8_TX loopback volume to 0 to avoid
glitches during device switch from speaker to headphone or
vice versa during FM audio playback.

Change-Id: Ib999b53c11cbd6ebcc8aa4c5e3c5332b7683b03c
2 files changed