msm: mdss: fix border configurations for split DSI cases

Previously, all split dsi panels had two panel files and border-right
of DSI0 and border-left of DSI1 was set to 0 and all the kernel
calculations were based on that assumption. Replicate the same
scenario with the new single file panel configs by changing the border
values accordingly while setting the values for each DSI. And, include
the border configs during pipe configuration.

Change-Id: If7f5ed4d71ddc2ca26a8be34566df768b1ed7a13
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>