disp: msm: dsi: Skip soft reset during display disable

As per DSI HPG, Soft reset is not required to disable
video mode operation for version 1.3.0 and later. So,
add check to skip it during display disable.

Change-Id: If6d263bdf22f8a6fbef76d78d04bb9d11be05945
Signed-off-by: Ritesh Kumar <riteshk@codeaurora.org>