fix: SPs don't subscribe to CPU_OFF PSCI operation by default

Each MP SP would have to subscribe to CPU_OFF explicitly through its
partition manifest.

Change-Id: I60d05221205164ba3f525f835c8ed6748b150b1a
Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
diff --git a/src/manifest.c b/src/manifest.c
index f9d1703..bcab0ba 100644
--- a/src/manifest.c
+++ b/src/manifest.c
@@ -1471,7 +1471,7 @@
 	}
 
 	TRY(read_optional_uint32(&root, "power-management-messages",
-				 MANIFEST_POWER_MANAGEMENT_CPU_OFF_SUPPORTED,
+				 MANIFEST_POWER_MANAGEMENT_NONE_MASK,
 				 &vm->partition.power_management));
 	vm->partition.power_management &= MANIFEST_POWER_MANAGEMENT_ALL_MASK;
 	if (vm->partition.execution_ctx_count == 1 ||