linux-phytec-ti

ti_config_fragments/connectivity.cfg: enable usb serial options

Enable as modules USB_ACM, USB_SERIAL, and USB_SERIAL_FTDI_SIO so that
boards may communicate with connected devices.

Signed-off-by: Jacob Stiffler <j-stiffler@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>