adbd: use network connection in imx53qsb

The USB connection in imx53qsb is not working correctly,
so use network connection for adbd.

Change-Id: I04ed29db169a16195d840f7180b9f2eab45c185e
Reviewed-by: Andy Nichols <andy.nichols@digia.com>

recipes/adbd/files/imx53qsb/defaults

+VENDOR=0x18d1
+PRODUCT=0x0000
+SERIAL=$(hostname)-$(sed -e 's/://g' /sys/class/net/eth0/address)
+USE_ETHERNET=yes