disp: msm: dsi: add support to set continuous clock through phy

For phy ver 4.0 chipsets, configure DSI controller and DSI PHY to
force clk lane to HS mode always. This change was missed while
propagating from 4.14 to 4.19.

Change-Id: I60370034f7b9ed5d036d9d22f0807250afbcbcd5
Signed-off-by: Ritesh Kumar <riteshk@codeaurora.org>