ARM: dts: imx25-pinfunc: Add several pin configurations

This patch adds pin configurations for:
 - csi aud6
 - cspi1 uart3
 - csi uart5
 - cc
 - csi sdhc2
 - csi cspi3
 - sd1 cspi2
 - cspi1 pwm

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>