MFC PS3 vt(4) console support

r265871 (nwhitehorn):

  Move the PS3 framebuffer console to use vt instead of syscons and
  adjust GENERIC64 for PowerPC to use vt with it.

  Much to my chagrin, PS3 support seems to have bitrotted somewhat since
  the last time I tried it. ehci panics on attach and interrupt handling
  seems to be faulty. This should be fixed soon...

r269783 (dumbbell):

  Fix two files forgotten in r269783 (vt_generate_cons_palette)

r268895 (nwhitehorn):

  Enable X11 via xf86-video-scfb on the Playstation 3. This commit made
  from an xterm running for the first time on said Playstation.

Approved by:	nwhitehorn
Relnotes:	yes
MFC vt(4) driver for Sun creator(4) framebuffers

r269601 (nwhitehorn):

  Add a simple unaccelerated vt(4) framebuffer driver for Sun
  framebuffers handled by creator(4) (Sun Creator 3D, Elite 3D, etc.).
  This provides vt(4) consoles on all devices currently supported by
  syscons on sparc64.  The driver should also be easily adaptable to
  support newer Sun framebuffers such as the XVR-500 and higher.

  Many thanks to dumbbell@ (Jean-Sebastien Pedron) for testing this
  remotely during development.

r269783 (dumbbell):

  vt(4): Colors are indexed against a console palette, not a VGA palette

Sponsored by:	The FreeBSD Foundation