KVM: MIPS/TLB: Generalise host TLB invalidate to kernel ASID

Refactor kvm_mips_host_tlb_inv() to also be able to invalidate any
matching TLB entry in the kernel ASID rather than assuming only the TLB
entries in the user ASID can change. Two new bool user/kernel arguments
allow the caller to indicate whether the mapping should affect each of
the ASIDs for guest user/kernel mode.

- kvm_mips_invalidate_guest_tlb() (used by TLBWI/TLBWR emulation) can
  now invalidate any corresponding TLB entry in both the kernel ASID
  (guest kernel may have accessed any guest mapping), and the user ASID
  if the entry being replaced is in guest USeg (where guest user may
  also have accessed it).

- The tlbmod fault handler (and the KSeg0 / TLB mapped / commpage fault
  handlers in later patches) can now invalidate the corresponding TLB
  entry in whichever ASID is currently active, since only a single page
  table will have been updated anyway.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org