MLK-17684-2: drm/bridge: nwl-dsi: Let CRTC dictate the final bus format

MLK-17684-2: drm/bridge: nwl-dsi: Let CRTC dictate the final bus format

Use the bus format that was established by CRTC in
crtc->mode.private_flags.
This will be available during enable phase.

The DSI host will be configured via interface_color_coding
and pixel_format (DPI-2 interface ports).
Previously the interface_color_coding was hardcoded to 24-bit.

Set the DSI pixel format before it is necessary in
nwl_dsi_get_bit_clock, during imx_nwl_dsi_enable.

Signed-off-by: Mirela Rabulea <mirela.rabulea@nxp.com>