regulator: ab8500: Add support for the ab8540

To obtain full AB8540 regulator support, the AB8500 regulator driver
first needs to know its register layout and their initialisation values
for each. That information is provided via a couple of large data
structures which we provide here.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>