msm: kgsl: Correctly identify faulting UCHE client

Pagefault handler logs incorrect faulting block when the fauling
block is a UCHE client. Fix this by properly decoding the faulting
UCHE client from MID and UCHE_CLIENT_PF register value.

Change-Id: Ia936cb8badcd936eb58052cb1ef10bd57b74c3f6
Signed-off-by: Akhil P Oommen <akhilpo@codeaurora.org>