KVM: arm64: Fix set_id_regs selftest for ASIDBITS becoming unwritable

KVM: arm64: Fix set_id_regs selftest for ASIDBITS becoming unwritable

In commit 03c7527e97f7 ("KVM: arm64: Do not allow ID_AA64MMFR0_EL1.ASIDbits
to be overridden") we made that bitfield in the ID registers unwritable
however the change neglected to make the corresponding update to set_id_regs
resulting in it failing:

  ok 56 ID_AA64MMFR0_EL1_BIGEND
  ==== Test Assertion Failure ====
    aarch64/set_id_regs.c:434: masks[idx] & ftr_bits[j].mask == ftr_bits[j].mask
    pid=5566 tid=5566 errno=22 - Invalid argument
       1	0x00000000004034a7: test_vm_ftr_id_regs at set_id_regs.c:434
       2	0x0000000000401b53: main at set_id_regs.c:684
       3	0x0000ffff8e6b7543: ?? ??:0
       4	0x0000ffff8e6b7617: ?? ??:0
       5	0x0000000000401e6f: _start at ??:?
not ok 8 selftests: kvm: set_id_regs # exit=254

Remove ID_AA64MMFR1_EL1.ASIDBITS from the set of bitfields we test for
writeability.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20241216-kvm-arm64-fix-set-id-asidbits-v1-1-8b105b888fc3@kernel.org
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>