staging: wfx: drop macro API_SSID_SIZE

The maximum length of a SSID is defined by 802.11 specification. It is
already defined in mac80211: IEEE80211_MAX_SSID_LEN. Therefore, use this
generic definition.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200907101521.66082-27-Jerome.Pouiller@silabs.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>