feat(ff-a): add managed exit field in the manifest

Moving setting to enable/disable managed exit support from messaging
method field to a separate field in partition manifest. As of DEN0077A
FF-A v1.1 Beta0 section 5.2, managed exit support is moved out of
messaging-method field and is described in a separate field.

Signed-off-by: Maksims Svecovs <maksims.svecovs@arm.com>
Change-Id: I87506d7213b88d5a18073bea7357c381605d8b33
diff --git a/src/load.c b/src/load.c
index b700c59..0e4f9dd 100644
--- a/src/load.c
+++ b/src/load.c
@@ -152,6 +152,8 @@
 		vm_locked.vm->messaging_method =
 			manifest_vm->sp.messaging_method;
 
+		vm_locked.vm->managed_exit = manifest_vm->sp.managed_exit;
+
 		vm_locked.vm->boot_order = manifest_vm->sp.boot_order;
 		/* Updating boot list according to boot_order */
 		vm_update_boot(vm_locked.vm);