Update README.md

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## Rx packet flow and filtering config
After FPGA receives a packet, no matter the FCS/CRC is correct or not it will raise interrupt to Linux if the frame filtering rule allows. openwifi_rx_interrupt() function in sdr.c will be triggered to do necessary operation and give the information to upper layer (Linux mac80211 subsystem).
After FPGA receives a packet, no matter the FCS/CRC is correct or not it will raise interrupt to Linux if the frame filtering rule allows (See also [mac80211 frame filtering](https://www.kernel.org/doc/html/v4.9/80211/mac80211.html#frame-filtering)). openwifi_rx_interrupt() function in sdr.c will be triggered to do necessary operation and give the information to upper layer (Linux mac80211 subsystem).
- frame filtering