KVM: arm64: Add standard hypervisor firmware register

KVM: arm64: Add standard hypervisor firmware register

Introduce the firmware register to hold the standard hypervisor
service calls (owner value 5) as a bitmap. The bitmap represents
the features that'll be enabled for the guest, as configured by
the user-space. Currently, this includes support only for
Paravirtualized time, represented by bit-0.

Signed-off-by: Raghavendra Rao Ananta <[email protected]>
Reviewed-by: Gavin Shan <[email protected]>
[maz: tidy-up bitmap values]
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]