sun6i: Add sunxi_get_ss_bonding_id() function

Add a sunxi_get_ss_bonding_id() function, and use it to differentiate between
the A31s and the A31.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/arch/arm/include/asm/arch-sunxi/cpu.h b/arch/arm/include/asm/arch-sunxi/cpu.h
index 2c92b5c..8aeed2f 100644
--- a/arch/arm/include/asm/arch-sunxi/cpu.h
+++ b/arch/arm/include/asm/arch-sunxi/cpu.h
@@ -139,9 +139,14 @@
 
 #define SUNXI_CPU_CFG			(SUNXI_TIMER_BASE + 0x13c)
 
+/* SS bonding ids used for cpu identification */
+#define SUNXI_SS_BOND_ID_A31		4
+#define SUNXI_SS_BOND_ID_A31S		5
+
 #ifndef __ASSEMBLY__
 void sunxi_board_init(void);
 void sunxi_reset(void);
+int sunxi_get_ss_bonding_id(void);
 #endif /* __ASSEMBLY__ */
 
 #endif /* _CPU_H */