ARM: dts: msm: Add gpio for audio clk

APQ8084 audio machine driver requests the clk from
msm GPIO instead of SPMI only for CDP and MTP

Change-Id: I83b70b7ce3821173a2b02798299cff79414b9bbd
Signed-off-by: Vidyakumar Athota <vathota@codeaurora.org>