disp: msm: dsi: add additional validation checks for async cmd wait

Disable DSI command transfer async wait feature for DSI read commands
and the commands sent in non-embedded mode.

CRs-Fixed: 2579259
Change-Id: Ib3b08fbb091711aa4be87400b79d01f0dcc05e71
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>