ARM: dts: imx6sx-sdb: add gpio key support
This patch adds support for imx6sx-sdb board's gpio keys: SW4(FUNC1): KEY_VOLUMEUP SW5(FUNC2): KEY_VOLUMEDOWN Signed-off-by: Anson Huang <b20788@freescale.com> Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
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