msm: kgsl: Add the clock names for sdm845

Add new clock names to kgsl clocks. These are needed for writing
to GMU registers and for soft reset to work correctly.

Change-Id: I03f703e0afa5a673286e812f557ca699d2edc5bf
Signed-off-by: Harshdeep Dhatt <hdhatt@codeaurora.org>