Miscellaneous PSCI code cleanups

This patch implements the following cleanups in PSCI generic code:

1. It reworks the affinity level specific handlers in the PSCI implementation
   such that.

   a. Usage of the 'rc' local variable is restricted to only where it is
      absolutely needed

   b. 'plat_state' local variable is defined only when a direct invocation of
      plat_get_phys_state() does not suffice.

   c. If a platform handler is not registered then the level specific handler
      returns early.

2. It limits the use of the mpidr_aff_map_nodes_t typedef to declaration of
   arrays of the type instead of using it in function prototypes as well.

3. It removes dangling declarations of __psci_cpu_off() and
   __psci_cpu_suspend(). The definitions of these functions were removed in
   earlier patches.

Change-Id: I51e851967c148be9c2eeda3a3c41878f7b4d6978
diff --git a/services/std_svc/psci/psci_private.h b/services/std_svc/psci/psci_private.h
index bbc8c32..924a24f 100644
--- a/services/std_svc/psci/psci_private.h
+++ b/services/std_svc/psci/psci_private.h
@@ -94,11 +94,11 @@
 int psci_check_afflvl_range(int start_afflvl, int end_afflvl);
 void psci_do_afflvl_state_mgmt(uint32_t start_afflvl,
 			       uint32_t end_afflvl,
-			       mpidr_aff_map_nodes_t mpidr_nodes,
+			       aff_map_node_t *mpidr_nodes[],
 			       uint32_t state);
 void psci_acquire_afflvl_locks(int start_afflvl,
-				int end_afflvl,
-				mpidr_aff_map_nodes_t mpidr_nodes);
+			       int end_afflvl,
+			       aff_map_node_t *mpidr_nodes[]);
 void psci_release_afflvl_locks(int start_afflvl,
 				int end_afflvl,
 				mpidr_aff_map_nodes_t mpidr_nodes);
@@ -106,13 +106,13 @@
 void psci_set_max_phys_off_afflvl(uint32_t afflvl);
 uint32_t psci_find_max_phys_off_afflvl(uint32_t start_afflvl,
 				       uint32_t end_afflvl,
-				       mpidr_aff_map_nodes_t mpidr_nodes);
+				       aff_map_node_t *mpidr_nodes[]);
 
 /* Private exported functions from psci_setup.c */
 int psci_get_aff_map_nodes(unsigned long mpidr,
 				int start_afflvl,
 				int end_afflvl,
-				mpidr_aff_map_nodes_t mpidr_nodes);
+				aff_map_node_t *mpidr_nodes[]);
 aff_map_node_t *psci_get_aff_map_node(unsigned long, int);
 
 /* Private exported functions from psci_affinity_on.c */