Remove own_id global variable from SP deployments

Move own_id to local namespace as both ffarpc_call_ep and ffarpc_caller
dependency on global own_id has been resolved.

Signed-off-by: Imre Kis <imre.kis@arm.com>
Change-Id: I86b68a4a05285763218a9e60d6e4d4877b322707
8 files changed