amlogic: Fix prefixes in the helpers file

The code is the common directory is now generic, no need to have the SoC
prefix hardcoded in the function names.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Change-Id: Ied3a5e506b9abd4c2d6f893bafef50019bff24f1
diff --git a/plat/amlogic/common/aml_topology.c b/plat/amlogic/common/aml_topology.c
index 5fbad73..0a04c11 100644
--- a/plat/amlogic/common/aml_topology.c
+++ b/plat/amlogic/common/aml_topology.c
@@ -49,5 +49,5 @@
 	if (cpu_id >= PLATFORM_MAX_CPUS_PER_CLUSTER)
 		return -1;
 
-	return plat_gxbb_calc_core_pos(mpidr);
+	return plat_calc_core_pos(mpidr);
 }