drm/msm/sde: fix excl_rect input rect reading

Remove the wrong addition of 1 to the exclusion rect width
and height while reading from the user. And add excl rect
to the crtc status debugfs node.

Change-Id: Ic2e1516344808655856abe833c507aad04f37f27
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>