create twl4030-irq.c

Split the IRQ support out of twl4030-core.c into twl4030-irq.c,
including some minor tidy-ups and a note_interrupt() paranoia
in case of flakiness with some PIH interrupt.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/mfd/Makefile

@@ -12,7 +12,7 @@ obj-$(CONFIG_MFD_T7L66XB)	+= t7l66xb.o
 obj-$(CONFIG_MFD_TC6387XB)	+= tc6387xb.o
 obj-$(CONFIG_MFD_TC6393XB)	+= tc6393xb.o
 
-obj-$(CONFIG_TWL4030_CORE)	+= twl4030-core.o
+obj-$(CONFIG_TWL4030_CORE)	+= twl4030-core.o twl4030-irq.o
 
 obj-$(CONFIG_MFD_CORE)		+= mfd-core.o