msm: mdss: Fix advertising HDR capability

HDR capability is not getting exposed for msm8998.
This is happening after the msmfalcon changes got merged.
This fix adds the hdr capbility to msm8998 and removes
from msmfalcon.

CRs-Fixed: 1116049
Change-Id: I81e0b3d90a03db6e655341338e03aea2911de89f
Signed-off-by: Abhijit Kulkarni <kabhijit@codeaurora.org>