amlogic: Fix prefixes in the SoC specific files

Remove the GXBB prefix where needed and add SoC specific prefixes for
GXBB/GXL.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Change-Id: Ic3eb3a77ca2d9c779a9dee5cee786e9c16ecdb27
diff --git a/plat/amlogic/gxbb/gxbb_bl31_setup.c b/plat/amlogic/gxbb/gxbb_bl31_setup.c
index 26419d4..6d6b2ad 100644
--- a/plat/amlogic/gxbb/gxbb_bl31_setup.c
+++ b/plat/amlogic/gxbb/gxbb_bl31_setup.c
@@ -73,7 +73,7 @@
 	 * In debug builds, we pass a special value in 'arg1' to verify platform
 	 * parameters from BL2 to BL31. In release builds it's not used.
 	 */
-	assert(arg1 == GXBB_BL31_PLAT_PARAM_VAL);
+	assert(arg1 == AML_BL31_PLAT_PARAM_VAL);
 
 	/* Check that params passed from BL2 are not NULL. */
 	from_bl2 = (struct gxbb_bl31_param *) arg0;