new twl4030 SIH irq init

Switch to a different twl4030-irq SIH irq init scheme.  Its goal
is to remove some section issues while providing a data structure
that can be reused by generic SIH IRQ handling code.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>