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For practical reasons as well as security related ones, not all
capabilities are supported for protected VMs in pKVM.

Add a function that restricts the capabilities for protected VMs.
This behaves as an allow-list to ensure that future capabilities
are checked for compatibility and security before being allowed
for protected VMs.
Signed-off-by: Fuad Tabba <tabba@google.com>
Acked-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240423150538.2103045-30-tabba@google.com

Signed-off-by: Marc Zyngier <maz@kernel.org>