drm/msm/sde: add maxlinewidth to rotator capabiilty

Maximum line width of rotator specifies the maximum image
width in pixel supported by inline rotator. Export this
information in capability blob for client query.

CRs-Fixed: 2009714
Change-Id: Ic1125ec7d9be8224cce174742e14fe8a523a8b82
Signed-off-by: Alan Kwong <akwong@codeaurora.org>