drm/msm/dsi-staging: alter phy configurations to support SDM845

Alter phy configurations for DB mode enabling and lane map settings to
support SDM845. Alter clock name from core clk to escape clk

Change-Id: Ia0356012f83ecef2017d57cffc7ed994e975a8a0
Signed-off-by: Shashank Babu Chinta Venkata <sbchin@codeaurora.org>