ARM: dts: imx6qdl-sabresd: Support headphone and microphone detection

Add "DMIC" rounting, headphone and microphone detect gpio for sound
card, then output sound can switch between headphone and speaker.
input sound can switch between DMIC and AMIC.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>