apq8074:audio: Support up to eight TX and RX channels
apq8074:audio: Support up to eight TX and RX channels

Ultrasound digital pen service requires six TX channels for
the service performance improvement.

Change-Id: If98b8e4339a0201d3f75b3ef820dfb2f32fd8299
Signed-off-by: Ravit Dennis <45cb2da659e61008799a3892a3d8579e0b7da45f@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas