msm: mdss: fix dsi phy strength parameters configuration

The strength settings for DSI phy are configured using two
board specific parameters. Currently, one of those parameters
is not configured for DSI-0 which results in DCS read failures.
Fix this by correctly configuring these strength settings for
DSI-0.

Change-Id: Ibeafe8655137112e7bffba13a1851ce98810bfeb
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>