KVM: arm64: Rename firmware pseudo-register documentation file

KVM: arm64: Rename firmware pseudo-register documentation file

In preparation for describing the guest view of KVM/arm64 hypercalls in
hypercalls.rst, move the existing contents of the file concerning the
firmware pseudo-registers elsewhere.

Cc: Raghavendra Rao Ananta <rananta@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Fuad Tabba <tabba@google.com>
Acked-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240423150538.2103045-27-tabba@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>