Replace twl4030-pwrirq with the more capable generic TWL SIH
support.

"More capable" includes standard support for IRQ trigger modes;
so make the RTC and USB transceiver drivers use genirq for that.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>