sunxi: Fix typo in include guard

Signed-off-by: Sam Edwards <CFSworks@gmail.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/arch/arm/include/asm/arch-sunxi/pmic_bus.h b/arch/arm/include/asm/arch-sunxi/pmic_bus.h
index 3ccfe13..5ab9b28 100644
--- a/arch/arm/include/asm/arch-sunxi/pmic_bus.h
+++ b/arch/arm/include/asm/arch-sunxi/pmic_bus.h
@@ -6,7 +6,7 @@
  */
 
 #ifndef _SUNXI_PMIC_BUS_H
-#define _SUNXI_PMIS_BUS_H
+#define _SUNXI_PMIC_BUS_H
 
 int pmic_bus_init(void);
 int pmic_bus_read(u8 reg, u8 *data);