wifi: wilc1000: remove AKM suite be32 conversion for external auth request

The driver currently raises the following sparse warning:
[...] cfg80211.c:360:42: warning: incorrect type in assignment (different
base types)
[...] cfg80211.c:360:42:    expected unsigned int key_mgmt_suite
[...] cfg80211.c:360:42:    got restricted __be32 [usertype]
  CHECK   drivers/net/wireless/microchip/wilc1000/netdev.c

This conversion was needed because historically the external supplicant
(observed with wpa_supplicant) expects AKM suite as big endian in
NL80211_CMD_EXTERNAL_AUTH message when the AKM suite is WLAN_AKM_SUITE_SAE.
This is not needed anymore:
- new (to be released) versions of wpa_supplicant now reads it in host
  endian _while_ keeping compatibility for older drivers
- for new drivers used with current/old wpa_supplicant, this conversion has
  been added to nl80211 to force big endian when the AKM suite is
  WLAN_AKM_SUITE_SAE

Remove this not-needed-anymore conversion to fix the sparse warning.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202308290615.lUTIgqUl-lkp@intel.com/
Tested-on: WILC1000 hwB SPI WILC_WIFI_FW_REL_16_1-13452
Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240215-nl80211_fix_akm_suites_endianness-v1-2-57e902632f9d@bootlin.com