mx6sabresd: Add DM_GPIO support

Add the DM_GPIO related config for mx6sabresd.
Also add the gpio request calls.

Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
diff --git a/configs/mx6sabresd_defconfig b/configs/mx6sabresd_defconfig
index cbacd7d..916ade1 100644
--- a/configs/mx6sabresd_defconfig
+++ b/configs/mx6sabresd_defconfig
@@ -68,6 +68,7 @@
 CONFIG_FASTBOOT_BUF_SIZE=0x10000000
 CONFIG_FASTBOOT_FLASH=y
 CONFIG_FASTBOOT_FLASH_MMC_DEV=2
+CONFIG_DM_GPIO=y
 CONFIG_DM_MMC=y
 CONFIG_FSL_ESDHC=y
 CONFIG_SPI_FLASH=y