msm: mdss: dsi: enable LPRX and CDRX only for logical data lane 0

The low power receiver (LPRX) and contention detection receiver (CDRX)
need to be enabled only for the physical data lane corresponding to the
logical data lane 0. Modify the code to implement this while accounting
for any possible data lane swap configurations.

CRs-Fixed: 1035315
Change-Id: I0082109fc3c0a56af3f181ae0b063c56aa7095f2
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>