msm: kgsl: Skip soft reset for A304

A304 gpu is not able to update the TTBR0 register via the
GPU self-programming path after soft reset. This will result
into NOC error in GPU fault recovery path. To avoid this
use hard reset path for A304.

CRs-Fixed: 775197
Change-Id: I9663780ea601b7b5e8780111f286dec1950e5c25
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>