regulator: ab8500: Decomission platform data header

The platform data header was only used to pass platform
data from board files. We now populate the regulators
exclusively from device tree, so the header contents can
be moved into the regulator drivers.

Cc: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20201205004057.1712753-2-linus.walleij@linaro.org


Signed-off-by: Mark Brown <broonie@kernel.org>