disp: msm: dsi: Only enable lanes required during phy enable

Currently we are enabling all the lanes irrespective of the
lanes we are actually going to use. Add support to enable
only those lanes that are required and thus save power.

Change-Id: I9aae76eeaa05a79337d4e4b1f2e36ea9842bd580
Signed-off-by: Srihitha Tangudu <quic_tangudu@quicinc.com>