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/include/platform_def.h b/plat/amlogic/gxbb/include/platform_def.h
index bd6ce32..a5cbe78e 100644
--- a/plat/amlogic/gxbb/include/platform_def.h
+++ b/plat/amlogic/gxbb/include/platform_def.h
@@ -16,7 +16,7 @@
 #define PLATFORM_LINKER_ARCH		aarch64
 
 /* Special value used to verify platform parameters from BL2 to BL31 */
-#define GXBB_BL31_PLAT_PARAM_VAL	ULL(0x0F1E2D3C4B5A6978)
+#define AML_BL31_PLAT_PARAM_VAL	ULL(0x0F1E2D3C4B5A6978)
 
 #define PLATFORM_STACK_SIZE		UL(0x1000)