msm: mdss: dp: set failsafe link params when DPCD read fails

For DPCD read failures, set link parameters corresponding to
the fail safe link resolution to conform to the display port
specification.

CRs-Fixed: 2010344
Change-Id: I06f56f508fe7adcb9e76f1a8597fc59cdadd741b
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>