msm: kgsl: Add adreno_is checks for A320 and A305

The adreno_is_a320 and adreno_is_a305 run-time chip id
checks were missing from adreno.h. These are needed by
at least one change to follow, in setting up the CP ROQ.

Change-Id: I466198f62d0554e83b9f3261db267fa8220584dd
Signed-off-by: Kevin Matlage <kmatlage@codeaurora.org>