wifi: brcmfmac: cyw: support external SAE authentication in station mode

wifi: brcmfmac: cyw: support external SAE authentication in station mode

Firmware has SME functionality but would like the userspace to handle
SAE authentication. This patch adds support for such an external SAE
authentication mechanism in station mode.

Signed-off-by: Chung-Hsien Hsu <chung-hsien.hsu@infineon.com>
Signed-off-by: Chi-hsien Lin <chi-hsien.lin@infineon.com>
[arend: rework patch for per-vendor framework]
Tested-by: James Prestwood <prestwoj@gmail.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Link: https://patch.msgid.link/20250425085519.492267-4-arend.vanspriel@broadcom.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>