ARM: dts: imx7d-smegw01: Fix USB host over-current polarity

Currently, when resetting the USB modem via AT commands, the modem is
no longer re-connected.

This problem is caused by the incorrect description of the USB_OTG2_OC
pad. It should have pull-up enabled, hysteresis enabled and the
property 'over-current-active-low' should be passed.

With this change, the USB modem can be successfully re-connected
after a reset.

Cc: stable@vger.kernel.org
Fixes: 9ac0ae97 ("ARM: dts: imx7d-smegw01: Add support for i.MX7D SMEGW01 board")
Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>