irqchip/gic: Add dependency for ARM_GIC_MAX_NR

CONFIG_ARM_GIC_MAX_NR is enabled by default.
It is redundant in x86 and IA-64 where is
without GIC.

Signed-off-by: Jiangfeng Xiao <xiaojiangfeng@huawei.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

drivers/irqchip/Kconfig

@@ -19,6 +19,7 @@ config ARM_GIC_PM
 
 config ARM_GIC_MAX_NR
 	int
+	depends on ARM_GIC
 	default 2 if ARCH_REALVIEW
 	default 1