Use drv_xpu register 0 for LBT threshold setting. 0 will enable FPGA threshold auto setting by ad9361_rf_set_channel() in sdr.c. Other value will set static threshold (that value) to FPGA

Fix various typos

Found via codespell v2.1.dev0
`codespell -q 3 -L ans,filp,fils,hsi`

Merge pull request #54 from lnceballosz/master

NGI0 - Updating licensing aspects according REUSE

Update sdr.h

adding license and copyright headers

Linux queue waking/sleeping decision update: LARGE FPGA models were using small MAX_NUM_DMA_SYMBOL but now is based on /proc/device-tree/model information

sdr driver update for 80211n

the side channel (timestamp, frequency offset, CSI, equalizer) feature

add recent update:
1. add git revision software register 7 to DRV_XPU module (not FPGA XPU module)
2. fix the print of hdr->seq_ctrl in sdr.c
3. add ht_flag display to sdr.c
4. remove the sysid from

add recent update:
1. add git revision software register 7 to DRV_XPU module (not FPGA XPU module)
2. fix the print of hdr->seq_ctrl in sdr.c
3. add ht_flag display to sdr.c
4. remove the sysid from devicetree because new we have our own git revision read back solution in FPGA (XPU register 63) and driver (the sotware register 7 of drv_xpu)
5. add sudo to update_sdcard.sh to make the image generation without SD card in the test-bed easier

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update source coed of: 4 fpga queues and better driver/fpga flow control to avoid crash. improved slice cfg and printing

prepare upgrade

initial commit