amlogic: Fix prefixes in the MHU code

Make the MHU code AML specific adding a new aml_* prefix and remove the
GXBB prefix from the register names.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Change-Id: I8f20918e29f08542bd71bd679f88e65b4efaa7d2
diff --git a/plat/amlogic/common/include/aml_private.h b/plat/amlogic/common/include/aml_private.h
index 9670c87..0d5a26c 100644
--- a/plat/amlogic/common/include/aml_private.h
+++ b/plat/amlogic/common/include/aml_private.h
@@ -16,11 +16,11 @@
 void aml_setup_page_tables(void);
 
 /* MHU functions */
-void mhu_secure_message_start(void);
-void mhu_secure_message_send(uint32_t msg);
-uint32_t mhu_secure_message_wait(void);
-void mhu_secure_message_end(void);
-void mhu_secure_init(void);
+void aml_mhu_secure_message_start(void);
+void aml_mhu_secure_message_send(uint32_t msg);
+uint32_t aml_mhu_secure_message_wait(void);
+void aml_mhu_secure_message_end(void);
+void aml_mhu_secure_init(void);
 
 /* SCPI functions */
 void scpi_set_css_power_state(u_register_t mpidr, uint32_t cpu_state,