drivers/arm/css/scmi: Update power domain protocol version to 2.0

The SCMI power domain protocol in firmware has been updated to v2.0,
thus update the corresponding version in TF-A too.

Signed-off-by: Nicola Mazzucato <nicola.mazzucato@arm.com>
Change-Id: If3920ff71136dce94b2780e29a47f24aa09876c0
1 file changed