dp: L4T: t186: fix eDP panel initialization

eDP panel initialization was broken on L4T platforms due to the
changes made to early enable fbconsole on DP on Sunstreaker.

DP early-enable is enabled if fbconsole is enabled. But currently,
early-enable is not suitable with internal panels because this
feature enables dc as part of dp_init only for internal panels.
Since dp_init is called as part of _tegra_dc_enable() in dc probe,
dc_enable() gets called recursively, causing unexpected failures.

Hence, for internal panels, updating fb monitor specs (which
updates mode and enables DC) as past of tegra_dc_dp_detect()
helps in enabling DC at the end of probe. To avoid any effect
on DP functionality on Sunstreaker and any other platforms, kept
early-enable for external DP panels as it is.

bug 200434630

Change-Id: I9e0571d246c5c1c916dc069e62ed21c6b660f462
Signed-off-by: Naveen Kumar S <nkumars@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2016296
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

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