mfd: Rename struct irq_data to struct sih_irq_data

struct irq_data is the preferred name for the data associated to an
interrupt in the core code.

Signed-off-by: Thomas Gleixner <[e-mail]>
Reviewed-by: Ingo Molnar <[e-mail]>

drivers/mfd/twl4030-irq.c

···
 	u8	irq_lines;		/* number of supported irq lines */
 
 	/* SIR ignored -- set interrupt, for testing only */
-	struct irq_data {
+	struct sih_irq_data {
 		u8	isr_offset;
 		u8	imr_offset;
 	} mask[2];