Revert "video: tegra: dc: make SOR instance configurable"

Revert "video: tegra: dc: make SOR instance configurable"

This reverts commit 5b78fbb15ed1ab233a1017fdb17abb8c5bae11d0.

This commit breaks L4T_on_Foster's HDMI display.
This CL is for T186 and not necessary for L4T r23.

bug 1700729

Change-Id: Ic917e9b721cbcc5e183d0f83c69087e7022c0a7d
Signed-off-by: Jong Kim <jongk@nvidia.com>
Reviewed-on: http://git-master/r/827849
(cherry picked from commit 1d3a74181708916ec15b08ef228e80c1c63ecbbf)
Reviewed-on: http://git-master/r/932963
GVS: Gerrit_Virtual_Submit
Reviewed-by: Winnie Hsu <whsu@nvidia.com>