UPSTREAM: KVM: arm64: Add bit masks for HAFGRTR_EL2

To support HAFGRTR_EL2 supported in nested virt in the following
patch, first add its bitmask definitions based on DDI0601 2023-09.

Reviewed-by: Mark Brown <broonie@kernel.org>
Bug: 278749606
Change-Id: I8169e373bd1737b9212a2b5bbf32ac993fadfcba
Signed-off-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231214100158.2305400-9-tabba@google.com
(cherry picked from commit f9d6ed02)