mips/kvm: Improve code formatting in arch/mips/kvm/kvm_locore.S

No code changes, just reflowing some comments and consistently using
tabs and spaces.  Object code is verified to be unchanged.
Signed-off-by: NDavid Daney <david.daney@cavium.com>
Acked-by: NRalf Baechle <ralf@linux-mips.org>
Acked-by: NPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: NJames Hogan <james.hogan@imgtec.com>
Signed-off-by: NGleb Natapov <gleb@redhat.com>