Revert "ARM: dts: twl4030: Add iio properties for bci subnode"

This reverts commit af19161a,
which breaks the omap3 device tree build due to a wrong reference.

I accidently queued this change via the power supply subsystem while
telling Marek at the same time, that it should go through Tony.
Following that I did miss Stephen's messages about the build failure in
linux-next and since he switched to merging an older snapshot nobody
else noticed the problem in my tree. I didn't notice myself, since I
did not build any device tree files assuming none have changed by me.

Signed-off-by: Sebastian Reichel <sre@kernel.org>
Reported-by: Felipe Balbi <balbi@ti.com>
Tested-by: Felipe Balbi <balbi@ti.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Tested-by: Kevin Hilman <khilman@linaro.org>
Acked-by: Tony Lindgren <tony@atomide.com>