msm: mdss: dsi: Remove redundant opmode configuration

The DSI opmode config is done as part of dsi_on, if required.
The additional call in LINK_READY is not protected and could
clobber the DSI control register during early wakeup.
Removing this call to avoid that situation.

Change-Id: I9a1bfe3f616568d0ff4d1a88311d9d5cbe807ea2
Signed-off-by: Rajkumar Subbiah <rsubbia@codeaurora.org>