refactor(plat/allwinner): allow new AA64nAA32 position

In newer Allwiner SoCs, the AA64nAA32 wires are mapped to a new register
called "General Control Register0" in the manual rather than the
"Cluster 0 Control Register0" in older SoCs.

Now the position of AA64nAA32 (reg and bit offset) is defined in a few
macros instead assumed to be at bit offset 24 of
SUNXI_CPUCFG_CLS_CTRL_REG0.

Change-Id: I933d00b9a914bf7103e3a9dadbc6d7be1a409668
Signed-off-by: Icenowy Zheng <icenowy@sipeed.com>
diff --git a/plat/allwinner/sun50i_h6/include/sunxi_cpucfg.h b/plat/allwinner/sun50i_h6/include/sunxi_cpucfg.h
index a2b94af..5bfda5d 100644
--- a/plat/allwinner/sun50i_h6/include/sunxi_cpucfg.h
+++ b/plat/allwinner/sun50i_h6/include/sunxi_cpucfg.h
@@ -29,4 +29,7 @@
 #define SUNXI_PWR_SW_DELAY_REG		(SUNXI_R_CPUCFG_BASE + 0x0140)
 #define SUNXI_CONFIG_DELAY_REG		(SUNXI_R_CPUCFG_BASE + 0x0144)
 
+#define SUNXI_AA64nAA32_REG		SUNXI_CPUCFG_CLS_CTRL_REG0
+#define SUNXI_AA64nAA32_OFFSET		24
+
 #endif /* SUNXI_CPUCFG_H */