MFC PS3 vt(4) console support

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

git-svn-id: svn://svn.freebsd.org/base/stable/10@271111 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f