msm: kgsl: Disable RB sampler data path optimization

Disable RB sampler data path DP2 clock gating optimization
for 1-SP A5XX GPU's. Optimization leads to precision
difference during interpolation which cause rendering
difference between Binning and Direct rendering mode.

Change-Id: I40d1ce2f5db0ed75453feda5c31152f8201b8697
Signed-off-by: Sunil Khatri <sunilkh@codeaurora.org>