msm: sde: add setup command for inline regdma start trigger

Add setup sequence for inline/offline mode to the start of
existing regdma sequence to put the hardware in proper operating
mode.

CRs-Fixed: 2009714
Change-Id: Id3ef5ba06a99f7d68ea10c53f3afb097677b265a
Signed-off-by: Alan Kwong <akwong@codeaurora.org>