drm/msm/sde: fix sui_block_xin_mask in SM6150

Enable xin-id 1 corresponding to DMA0 to be unblocked
in sui_block_xin_mask. The  xin-mask defines
which xin-clients should be be blocked during secure-ui
session.

Change-Id: Icfae770eb0614cfec28f65633672d30ec4e9b048
Signed-off-by: Raviteja Tamatam <travitej@codeaurora.org>