msm: mdss: add support of border area

Add border_x_off and border_y_off to track the
left/right/top/bottom border parameters defined
at panel dtsi file. Adding border_x_off and
border_y_off to pipe's destination x and y so that
border can be formed during blending operation at
mixer.

Change-Id: I29673df30318c7d9064adae996da62823db3230d
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>