ARM: dts: imx25-eukrea-mbimxsd25-baseboard: Fix the 'cd-gpios' property

The GPIO polarity is missing in the cd-gpios property.

Fix it, so that the following build warnings are gone:

  DTC     arch/arm/boot/dts/imx25-eukrea-mbimxsd25-baseboard.dtb
arch/arm/boot/dts/imx25-eukrea-mbimxsd25-baseboard.dtb: Warning (gpios_property): cd-gpios property size (8) too small for cell size 2 in /soc/aips@53f00000/esdhc@53fb4000
  DTC     arch/arm/boot/dts/imx25-eukrea-mbimxsd25-baseboard-cmo-qvga.dtb
arch/arm/boot/dts/imx25-eukrea-mbimxsd25-baseboard-cmo-qvga.dtb: Warning (gpios_property): cd-gpios property size (8) too small for cell size 2 in /soc/aips@53f00000/esdhc@53fb4000
  DTC     arch/arm/boot/dts/imx25-eukrea-mbimxsd25-baseboard-dvi-svga.dtb
arch/arm/boot/dts/imx25-eukrea-mbimxsd25-baseboard-dvi-svga.dtb: Warning (gpios_property): cd-gpios property size (8) too small for cell size 2 in /soc/aips@53f00000/esdhc@53fb4000
  DTC     arch/arm/boot/dts/imx25-eukrea-mbimxsd25-baseboard-dvi-vga.dtb
arch/arm/boot/dts/imx25-eukrea-mbimxsd25-baseboard-dvi-vga.dtb: Warning (gpios_property): cd-gpios property size (8) too small for cell size 2 in /soc/aips@53f00000/esdhc@53fb4000

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>