[x86] Removed unused vmcb file and its references.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>
[x86] Add intercept types and enable them

o Added all the intercept type definitions.
o Enabled almost all of them for now to verify the
  custom firmware.
o With this the paged real mode page faults are
  being correctly intercepted and given to VMM.

Signed-off-by: Himanshu Chauhan <hschauhan@nulltrace.org>