regulator: Updates for v3.18

This time around most of the changes are a lot of new drivers along with
the standard set of fixes and cleanups (thanks again largely to Axel
Lin).  We do have one nice new feature in the core which factors out the
disappointingly tricky code around DT parsing, only a couple of drivers
have been converted so far:

 - Factor out the code for parsing the standard bindings for a set of
   regulators out of DT, making the probe part of a lot of drivers
   simplier.
 - New drivers for Dialog DA9213, HiSilicon HI6420, Intersil ISL9305/H,
   Ricoh RN5T618, Rockchip RK808, Skyworks SKY81452, Silergy SYR82x, and
   Qualcomm RPM.
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