ARM: dts: msm: add sde rotator device node to sdm845

Add v4l2 rotator device to sdm845. V4l2 rotator is used
by display to rotate images prior to final composition
by mdss.

CRs-Fixed: 2009709
Change-Id: Idb0b9969510327b8f883e6f429e77fd1e98fcafd
Signed-off-by: Alan Kwong <akwong@codeaurora.org>