ASoC: msm8974: Prefix "qcom," to primary AUXPCM GPIO defines

Primary AUXPCM GPIO definitions in device tree are internal to
and hence should have the "qcom," prefix. Update the Device
Tree entried and the machine driver which uses those GPIOs.
Also, rename the AUXPCM node definitions and make it more specific
to Primary AUXPCM

Change-Id: I923920e23e816994def8c6f658b34f28a4ec2451
Signed-off-by: Banajit Goswami <bgoswa@codeaurora.org>