regmap: Updates for v4.21

This has been a busy release for the regmap-irq code, there's several
new features been added, including an API cleanup for how we specify
types that affected one existing driver (gpio-max77620):

 - Support for hardware that flags rising and falling edges on separate
   status bits from Bartosz Golaszewski.
 - Support for explicitly clearing interrupts before unmasking from
   Bartosz Golaszewski.
 - Support for level triggered IRQs from Matti Vaittinen.
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Merge remote-tracking branch 'regmap/topic/irq' into regmap-next