msm: kgsl: Set UCHE_CACHE_WAYS_VFD to 0x7 for A4XX

This setting allows VFD to access most of UCHE
(7 of the 8 ways), which can increase performance
in some vertex-heavy cases.

Change-Id: I08e21f1408f682e996e29ede591593f8c27ba413
Signed-off-by: Kevin Matlage <kmatlage@codeaurora.org>