ArmVirtPkg: RMM 1.0-rel0 - Update RIPAS state to add RipasDev

The section A5.2.2 'Realm IPA state' in the RMM 1.0-rel0 spec
introduces a new Realm IPA state value to represent address
where memory of an assigned Realm device is mapped.

Therefore, update the RIPAS enum to add RipasDev.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>