ARM: dts: imx25-pinfunc: remove input values for pinfuncs without input register

input values are only useful for pin functions which define a input
register. This patch removes all input values of pin functions which do
not have an input configuration register.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>