OMAP: Don't warn user about expected behaviour in mmc-twl4030

The approach that's being taken by the mmc-twl4030 driver to disabling
regulators is a normal and supported one so there is no need to print
messages on the console warning about this - their system is functioning
normally.

Signed-off-by: Mark Brown <broonie@sirena.org.uk>
Signed-off-by: Tony Lindgren <tony@atomide.com>