regmap: Updates for v4.13

The usual small smattering of activity for regmap this time round:

 - Addition of support for the 1-Wire bus standard.
 - Options that allow support for more interrupt controllers with
   regmap-irq.
 - Only build LZO cache support if it's actually being used.
Merge remote-tracking branches 'regmap/topic/1wire', 'regmap/topic/irq' and 'regmap/topic/lzo' into regmap-next