staging: rtl8723bs: remove dead antenna diversity infrastructure (FAT/SWAT)

Manual code tracking via grep reveals that the driver contains code
for Fast Antenna Training (FAT) and Software Antenna Switching (SWAS)
that are completely uninitialized, unread, or write-only.

Remove the 'struct fat_t' definition from hal/odm.h and refactor the
fallback path in hal/rtl8723b_phycfg.c. Because the unassigned
structural member 'RxIdleAnt' naturally defaults to 0, the conditional
path check statically resolves to false, permanently routing RFPath to
RF_PATH_B whenever antenna diversity is active. Hardcode this layout
behavior to match factual reality and remove the now unused macro
'MAIN_ANT'.

Additionally, purge the write-only 'struct swat_t' infrastructure from
hal/odm.h and include/hal_data.h. Inside hal/odm.c, eliminate the dead
variable tracking assignments while explicitly preserving the hardware
register read to rDPDT_control as a dummy read to ensure initialization
sequencing and hardware timing remain completely unaltered.

Lastly, clean up legacy comment baggage across hal/odm.c and
hal/odm_DIG.c. Remove arbitrary spreadsheet digits and references to
unsupported legacy chipsets (92E, 8723A, 8821, 8812) to ensure inline
notes are highly focused on the active RTL8723B Bluetooth coexistence
parameters.

Assisted-by: Gemini
Signed-off-by: Marinela Tatiana Selseth <marinela.selseth@firmwaredesign.org>
Link: https://patch.msgid.link/20261004222821.6524-1-marinela.selseth@firmwaredesign.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions