sethdlc : add recipe

   * sethdlc: get/set Linux HDLC packet radio modem driver port information
   * sethdlc is  a  program designed to set and/or report the configuration
     information associated with a soundcard radio modem port. This information
     includes  the  modem type, what I/O port, IRQ and DMA channel a particular
     modem port is using, and where to output a transmitter  keying (PTT) signal.

Signed-off-by: Chunrong Guo <B40290@freescale.com>
Signed-off-by: Joe MacDonald <joe.macdonald@windriver.com>