msm: pil-vpu: Add maple bus clock

Maple bus clock convention has changed. The clock is needed
for Maple(A5) to access bus. Both pil-vpu and vpu driver should
vote for the clock.

Change-Id: Iccded8a54e27952eebcc80d556a5bd3ae9e02a2d
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>