mdss: display-port: add mutex logic and configure data lanes

Add locking mechanism for host init. Remove mainlink_reset
before configuring the link rates.

Depending on the USB plug orientation, configure the
lane mapping register to support display-port over
usb-type-c port.

Change-Id: I7bf3fc6e102df113611b9450c92ecd4e50b26fb4
Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org>