MFS10 r273294 (r273178 in HEAD):

  Update vt(4) for UEFI defaults and special keys

  vt(4) is the default console for UEFI boot [1], and the bitmapped
  kern.vt.spclkeys sysctl has been replaced with individual kern.vt.kbd_*
  enable sysctls.

PR:		193710
Approved by:	re