msm_fb: hdmi_msm: dynamic sample rate change for non-hdcp

Adding support for other modules to dynamically change the
sampling rate in HDMI core for audio which is supported by
NON-HDCP surf/FFA as well.

Change-Id: I2e4f239e43251b2dc5f8529b7c352a94456ad974
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>