msm: kgsl: Simplify logic for VBIF registers across A3XX cores

VBIF registers are set dependent on what A3XX GPU core is present.
Set the registers from a table that is explicitly tied to each of
the A3XX GPU cores.  This will prevent side effects across cores
when changing a specific cores VBIF data.

Change-Id: I4c20cd891a940abd85459ce5bf548cf91d06004a
Signed-off-by: Carter Cooper <ccooper@codeaurora.org>