drm/msm/sde: Set VBIF Amem type during rotator hw config.

Program vbif Amem type during rotator hw config as clk ctrl
might be still on during gdsc toggle which will reset the register.

Change-Id: I199c345d2f9a7ea084f5dc63ddeed69fee091003
Signed-off-by: Kalyan Thota <kalyant@codeaurora.org>