regulator: cpr3-regulator: add support for per speed bin property values

Add support for parsing CPR3 regulator device tree properties
which are specified per speed bin as opposed to per fuse
combination.  This allows for significant reductions in device
tree property sizes in cases where all fuse combos associated
with a given speed bin utilize the same set of values.

Change-Id: Ieea1244e3e61ce9ec357ab2f92340558fb1fe38c
Signed-off-by: David Collins <collinsd@codeaurora.org>