Merge tag 'regmap-poll-field' of git://git.kernel.org/pub/scm/linux/kernel/git/brooni...

regmap: Add field polling macro

Requested by Maxime Ripard to make sun4i compile again (next time
the other way round is better).

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20171004104732.jkps4ufekfizcrkz@sirena.co.uk