drm/msm/dsi-staging: Dual Panel support in driver

Secondary  panels should use the corresponding DSI CTRL, DSI PHY0 and
Clocks. This change allows the driver to choose the PHY, CTRL index
and clock names depending on the type of panel. The probe for secondary
display should not result a probe failure in cases when only one
panel is being used.

Change-Id: Ief0863c5d3310efdcea4a36b0ec5c640ffe3970e
Signed-off-by: Satya Rama Aditya Pinapala <psraditya30@codeaurora.org>