Optional
https://nerivec.github.io/zigbee-on-host/types/spinel_spinel.StreamRawConfig.html
0x${hex} format
if true, trigger serial dtr/rts flipping to skip bootloader (meant for TI hw)
See
https://nerivec.github.io/zigbee-on-host/types/spinel_spinel.StreamRawConfig.html