msm: kgsl: Don't pad VA allocations on sm8150v2

sm8150v2 does not require VA allocations to be padded up.
Remove the VA padding requirement on this device.

Change-Id: Ibdafa78abe8a6fe0ab87d1d31af3cfc7874d25fc
Signed-off-by: Urvashi Agrawal <urvaagra@codeaurora.org>