cad: allow high-speed USB OTG

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
a: configure 3G modem GPIOs as GPIOs

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
a: remove for loops in bootcmd, upgradeu

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>