wifi: ath5k: remove unused ath5k_eeprom_info::ee_antenna

clang-struct [1] found that ee_antenna in struct ath5k_eeprom_info is
unused. The commit 1048643 ("ath5k: Clean up eeprom
parsing and add missing calibration data") added it, but did not use it
in any way. Neither, there is a later user.

So remove that unused member.

[1] https://github.com/jirislaby/clang-struct

Signed-off-by: Jiri Slaby (SUSE) <[email protected]>
Cc: Felix Fietkau <[email protected]>
Cc: Nick Kossifidis <[email protected]>
Cc: Luis Chamberlain <[email protected]>
Cc: Kalle Valo <[email protected]>
Cc: [email protected]
Signed-off-by: Kalle Valo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Jiri Slaby (SUSE)

drivers/net/wireless/ath/ath5k/eeprom.h

@@ -489,7 +489,4 @@ struct ath5k_eeprom_info {
 
 	/* Spur mitigation data (fbin values for spur channels) */
 	u16	ee_spur_chans[AR5K_EEPROM_N_SPUR_CHANS][AR5K_EEPROM_N_FREQ_BANDS];
-
-	/* Antenna raw switch tables */
-	u32	ee_antenna[AR5K_EEPROM_N_MODES][AR5K_ANT_MAX];
 };