drm/msm/dsi: update recommended non-embedded mode sequence

Removing dsi soft reset logic while arbitrating transferring
embedded mode and non-embedded dsi commands. This change
follows the recommended sequence for kona.

Change-Id: I05eef0c6cfd671f48fbfdf7cb2cab788e42bb1e5
Signed-off-by: Vara Reddy <varar@codeaurora.org>