warp7: defconfig: Switch to DM for I2C

This commit switches to DM I2C for warp7 and warp7_bl33 defconfigs.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/configs/warp7_bl33_defconfig b/configs/warp7_bl33_defconfig
index c7b8c54..4758d2b 100644
--- a/configs/warp7_bl33_defconfig
+++ b/configs/warp7_bl33_defconfig
@@ -45,3 +45,4 @@
 CONFIG_PINCTRL=y
 CONFIG_PINCTRL_IMX7=y
 CONFIG_DM_GPIO=y
+CONFIG_DM_I2C=y