SPMC: adjust the number of EC context to max number of PEs

According to [1] and in context of FF-A v1.0 a secure partition must
have either one EC (migratable UP) or a number of ECs equal to the
number of PEs (pinned MP). Adjust the SPMC manifest such that the
number of ECs is equal to the number of PEs.

[1] https://trustedfirmware-a.readthedocs.io/en/latest/components/


secure-partition-manager.html#platform-topology
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: Ie8c7d96ae7107cb27f5b97882d8f476c18e026d4

plat/arm/board/fvp/fdts/fvp_spmc_manifest.dts

@@ -44,14 +44,14 @@
 			is_ffa_partition;
 			debug_name = "cactus-secondary";
 			load_address = <0x7100000>;
-			vcpu_count = <2>;
+			vcpu_count = <8>;
 			mem_size = <1048576>;
 		};
 		vm3 {
 			is_ffa_partition;
 			debug_name = "cactus-tertiary";
 			load_address = <0x7200000>;
-			vcpu_count = <2>;
+			vcpu_count = <8>;
 			mem_size = <1048576>;
 		};
 	};