msm: kgsl: Add apb_pclk to the clock list and increase KGSL_MAX_CLKS

KGSL needs to enable apb_pclk for QDSS register access.
Add apb_pclk to the clock list. Increment KGSL_MAX_CLKS
to support apb_pclk.

Change-Id: I017628ddda2b5807aab4d8970a4ceab2d9174f53
Signed-off-by: Harshitha Sai Neelati <hsaine@codeaurora.org>