Fixup init.qcom.usb.sh

- Unterminated if statement broke the script
- Undefined $baseband broke the ability to set the rmnet module
    parameters.  This is critical because
    "echo 1 > /sys/module/rmnet_usb/parameters/rmnet_data_init"
    is required to register the rmnet device necessary for the modem.
Enable qcom-usb-sh service to load init.qcom.usb.sh