KVM: arm64: Fix comments related to GICv2 PMR reporting

Remove the repeated word 'the' from two comments.

Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210728130623.12017-1-wangborong@cdjrlc.com