arm64: tegra: Fix USB/ETH regulator for Foster

arm64: tegra: Fix USB/ETH regulator for Foster

The enable pins for the usb1/usb2/usb3 are meant to be driven in an
open-drain configuration. Not putting the pin in an open configuration
meant that on 50% of the boards, we won't be able to enable the
regulator given the VGS of the FET > 1.8 V

Bug 1550714

Change-Id: Ibc355efd363c1c97ea56facddabca174250cc8d0
Signed-off-by: Aly Hirani <ahirani@nvidia.com>
Reviewed-on: http://git-master/r/497086
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Raymond Poudrier <rapoudrier@nvidia.com>