Add voice call support for msm8x26 target

Update platform file to enable voice calls

These changes are already part of Qualcomm's initial HAL audio release
but were stripped off

Change-Id: I357969f0aca6e150bb95acb1b25d587615b0f375
Signed-off-by: Uday Kishore Pasupuleti <upasupul@codeaurora.org>