refactor(ffa): remove `plat` prefix

Rename files to remove the `plat` prefix and replace with a
module-specific prefix.

Change-Id: Ie64cefcdf91da7b20e520828d8e234af12ab5c85
Signed-off-by: Karl Meakin <karl.meakin@arm.com>
diff --git a/inc/hf/ffa/interrupts.h b/inc/hf/ffa/interrupts.h
index 8c0d990..398585d 100644
--- a/inc/hf/ffa/interrupts.h
+++ b/inc/hf/ffa/interrupts.h
@@ -13,27 +13,28 @@
 /**
  * Deactivate interrupt.
  */
-int64_t plat_ffa_interrupt_deactivate(uint32_t pint_id, uint32_t vint_id,
-				      struct vcpu *current);
+int64_t ffa_interrupts_deactivate(uint32_t pint_id, uint32_t vint_id,
+				  struct vcpu *current);
 
-void plat_ffa_handle_secure_interrupt(struct vcpu *current, struct vcpu **next);
-bool plat_ffa_inject_notification_pending_interrupt(
+void ffa_interrupts_handle_secure_interrupt(struct vcpu *current,
+					    struct vcpu **next);
+bool ffa_interrupts_inject_notification_pending_interrupt(
 	struct vcpu_locked next_locked, struct vcpu_locked current_locked,
 	struct vm_locked receiver_locked);
 
-bool plat_ffa_intercept_call(struct vcpu_locked current_locked,
-			     struct vcpu_locked next_locked,
-			     struct ffa_value *signal_interrupt);
+bool ffa_interrupts_intercept_call(struct vcpu_locked current_locked,
+				   struct vcpu_locked next_locked,
+				   struct ffa_value *signal_interrupt);
 
-struct vcpu *plat_ffa_unwind_nwd_call_chain_interrupt(struct vcpu *current);
+struct vcpu *ffa_interrupts_unwind_nwd_call_chain(struct vcpu *current);
 
-void plat_ffa_enable_virtual_interrupts(struct vcpu_locked current_locked,
-					struct vm_locked vm_locked);
+void ffa_interrupts_enable_virtual_interrupts(struct vcpu_locked current_locked,
+					      struct vm_locked vm_locked);
 
 /**
  * Reconfigure the interrupt belonging to the current partition at runtime.
  */
-int64_t plat_ffa_interrupt_reconfigure(uint32_t int_id, uint32_t command,
-				       uint32_t value, struct vcpu *current);
+int64_t ffa_interrupts_reconfigure(uint32_t int_id, uint32_t command,
+				   uint32_t value, struct vcpu *current);
 
-uint32_t plat_ffa_interrupt_get(struct vcpu_locked current_locked);
+uint32_t ffa_interrupts_get(struct vcpu_locked current_locked);