ARM: meson: Add support for AXG family

This patch adds support for the Amlogic AXG SoC, which is very close from
the Amlogic GXL SoCs with :
- Same 4xCortex-A53 CPUs but clocked at 1.2GHZ max
- DDR Interface limited to DDR4 16bit
- The whole physical register address space has been moved to 0xfxxxxxxx
- The pinctrl setup has changed
- The clock tree is different enough to use a different driver

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

include/configs/meson64.h

@@ -8,8 +8,13 @@
 #define __MESON64_CONFIG_H
 
 /* Generic Interrupt Controller Definitions */
+#if defined(CONFIG_MESON_AXG)
+#define GICD_BASE			0xffc01000
+#define GICC_BASE			0xffc02000
+#else /* MESON GXL and GXBB */
 #define GICD_BASE			0xc4301000
 #define GICC_BASE			0xc4302000
+#endif
 
 #define CONFIG_CPU_ARMV8
 #define CONFIG_REMAKE_ELF