drivers: mipi_dsi: dsi_mcux_2l: Update driver to support ULPS

Add new item ulps_control in binding. If the MIPI DSI on the SoC support
ULPS, and user set the bus to enter ULPS after transfer in mipi_dsi_msg,
driver will set the bus to enter ULPS.

Signed-off-by: Kate Wang <yumeng.wang@nxp.com>