regmap: Fixes for v4.2

As well as a few fixes and updates for API changes there's two new
features for the API:

 - Better support for handling a reset of the underlying hardware,
   marking the register map as needing a resync to the device when
   we need to do that automatically.
 - Support for querying the size and stride of the register map,
   allowing higher level frameworks to configure themselves more
   readily.
Merge remote-tracking branches 'regmap/topic/defaults', 'regmap/topic/irq' and 'regmap/topic/reg-params' into regmap-next