Fix bugs in (mostly) not-yet-activated parts of early/emergency output:

- map the hard-coded frame buffer address above KERNBASE.  Using the
  physical address only worked because of larger mapping bugs.

  The hard-coded frame buffer address only works on x86.  Use messy ifdefs
  to try to avoid warnings about unused code for other arches.

- remove the sysctl for reading and writing the table kernel console
  attributes.  Writing only worked for emergency output since normal
  output uses unalterd copies.

- fix the test for the emergency console being usable

- explain why a hard-coded attribute is used very early.  Emergency output
  works on x86 even before the pcpu pointer is initialized.

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