Fixed errors during compilation of OpenWRT kernel modules

Remove the reg 3 init in rx_intf.c:
to avoid openwifi_start calling hw_init to override the FPGA loopback flag in reg 3 (value 256)

openofdm_rx initialization with the help of macro definition in hw_def.h:

Now changing the macro in hw_def.h will change the related initialization part in all related drivers (rx_intf/xpu/openofdm_

openofdm_rx initialization with the help of macro definition in hw_def.h:

Now changing the macro in hw_def.h will change the related initialization part in all related drivers (rx_intf/xpu/openofdm_rx)

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Fix various typos

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

Update rx_intf.c

adding license and copyright headers

4 fpga queues and better driver/fpga flow control to avoid crash. improved slice cfg and printing (#23)

prepare upgrade

prepare for release

initial commit