msm: kgsl: Skip soft reset for A612 GPU

The IPC protocol between RGMU and CP will
not restart after soft reset. Hence skip
the soft reset for A612.

Change-Id: I2fbfba167e0303b546c64b8c7d0b74c9493aed4f
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>