KVM: arm64: nv: Describe trap behavior of SCTLR2_EL1

Add the complete trap description for SCTLR2_EL1, including FGT and the
inverted HCRX bit.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20250708172532.1699409-11-oliver.upton@linux.dev


Signed-off-by: Oliver Upton <oliver.upton@linux.dev>