amd64: Remove sc(4) from MINIMAL

[manu]

Summary

vt(4) supports bios and efi boot.
And since 0518832011 ("vt/vga: ignore ACPI_FADT_NO_VGA unless running virtualized")
was applied it will work everywhere.

MFC after: 1 month
MFC to: stable/13 only
Sponsored by: Beckhoff Automation GmbH & Co. KG

[portmaster_BSDforge.com]

My only objection is that I can NOT get textmode or very stable X on any of the NVIDIA
cards I use unless I build against sc. Does sc(4) use so much space that current kernels
become too big with it's presence? I vote against it's removal.

[imp]

Removing the 'backup' console from MINIMAL is fine.
Not too many people are using it, and those that are can hack up a MINIMAL_MINUS_VT_PLUS_SC config file easily enough.