video: fbcon: Keep atleast one mode in modelist

video: fbcon: Keep atleast one mode in modelist

Framebuffer console init requires atleast one valid
mode to exist for it to succeed.
Virtual terminals relies on the success of fbcon_init
without really checking the return value of this function.

tegra_dc_vga_mode already defined in dc.c. Removed duplicate
defination in hdmi.c and hdmi2.0.c

bug 200036424
bug 200130124
bug 200129681

Change-Id: Ia34da6ab3814f667a485d23ef88e1a52f8b5519b
Signed-off-by: Pankaj Dabade <pdabade@nvidia.com>
Signed-off-by: Naveen Kumar S <nkumars@nvidia.com>
Reviewed-on: http://git-master/r/707309
(cherry picked from commit 73a561a53469912d94c0dea866646c87ec257bef)
Reviewed-on: http://git-master/r/792235
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>