drm/msm/dp: fix stream programming for electrical compliance

Fix the stream programming by ensuring that stream parameters
including Main Stream Attribute and Transfer Unit data are
programmed before test patterns are sent to the compliance
sink.

CRs-Fixed: 2328019
Change-Id: I0559b836579c2d4b801d998a2d0cfbde34bf7cca
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>