ARM: gic: add __ASSEMBLY__ guard to C definitions

The GIC include file being used by some of the KVM assembly code,
wrap the C definitions with a #ifdef __ASSEMBLY__ guard.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

include/linux/irqchip/arm-gic.h

@@ -57,6 +57,8 @@
 #define GICH_MISR_EOI			(1 << 0)
 #define GICH_MISR_U			(1 << 1)
 
+#ifndef __ASSEMBLY__
+
 struct device_node;
 
 extern struct irq_chip gic_arch_extn;
@@ -72,4 +74,6 @@ static inline void gic_init(unsigned int nr, int start,
 	gic_init_bases(nr, start, dist, cpu, 0, NULL);
 }
 
+#endif /* __ASSEMBLY */
+
 #endif