STMicroelectronics STi System Configuration Controlled IRQs
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On STi based systems; External, CTI (Core Sight), PMU (Performance Management),
and PL310 L2 Cache IRQs are controlled using System Configuration registers.
This driver is used to unmask them prior to use.

Required properties:
- compatible	: Should be "st,stih407-irq-syscfg"
- st,syscfg	: Phandle to Cortex-A9 IRQ system config registers
- st,irq-device	: Array of IRQs to enable - should be 2 in length
- st,fiq-device	: Array of FIQs to enable - should be 2 in length

Optional properties:
- st,invert-ext	: External IRQs can be inverted at will.  This property inverts
		  these IRQs using bitwise logic.  A number of defines have been
		  provided for convenience:
			ST_IRQ_SYSCFG_EXT_1_INV
			ST_IRQ_SYSCFG_EXT_2_INV
			ST_IRQ_SYSCFG_EXT_3_INV
Example:

irq-syscfg {
	compatible    = "st,stih407-irq-syscfg";
	st,syscfg     = <&syscfg_cpu>;
	st,irq-device = <ST_IRQ_SYSCFG_PMU_0>,
			<ST_IRQ_SYSCFG_PMU_1>;
	st,fiq-device = <ST_IRQ_SYSCFG_DISABLED>,
			<ST_IRQ_SYSCFG_DISABLED>;
};