ARM: dts: imx27-apf27dev: Add pinctrl for cspi, sdhci, leds and keys

- add chip-select pinctrl for cspi
- add card-detect for sdhci2
- add pinctrl for gpio-leds and gpio-keys

Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@armadeus.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>