drm/bridge: tc358768: Separate video format config

drm/bridge: tc358768: Separate video format config

Sending long commands using the video buffer (to be implemented in
following patches) requires setting TC358768_DATAFMT and
TC358768_DSITX_DT registers for command transfer. The same registers
also need to be configured properly for video transfer.

The long commands will be sent between the bridge's pre_enable() and
enable(), and currently we configure the registers for video transfer in
pre_enable(). Thus, they would be overwritten by the long command
transfer code.

To prevent that from happening, set those registers for video transfer
in enable(), not in pre_enable().

Based on code from Parth Pancholi <parth.pancholi@toradex.com>

Tested-by: João Paulo Gonçalves <joao.goncalves@toradex.com> # Toradex Verdin AM62
Reviewed-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://patch.msgid.link/20260311-tc358768-v2-6-e75a99131bd5@ideasonboard.com
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>