amlogic: Fix prefixes in the SIP/SVC code

All the SIP/SVC related code is currently the same between GXL and GXBB.
Rename function names and register names to avoid hardcoding the GXBB
prefix.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Change-Id: I7e58ab68489df8d4762663fc01fb64e6899cc8bf
diff --git a/plat/amlogic/common/aml_scpi.c b/plat/amlogic/common/aml_scpi.c
index 6727029..28837a2 100644
--- a/plat/amlogic/common/aml_scpi.c
+++ b/plat/amlogic/common/aml_scpi.c
@@ -89,9 +89,9 @@
 
 void scpi_jtag_set_state(uint32_t state, uint8_t select)
 {
-	assert(state <= GXBB_JTAG_STATE_OFF);
+	assert(state <= AML_JTAG_STATE_OFF);
 
-	if (select > GXBB_JTAG_A53_EE) {
+	if (select > AML_JTAG_A53_EE) {
 		WARN("BL31: Invalid JTAG select (0x%x).\n", select);
 		return;
 	}