DPP2: Add Connector and C-sign-key in psk/sae credentials for reconfig

DPP2: Add Connector and C-sign-key in psk/sae credentials for reconfig

If the Enrollee indicates support for DPP R2 or newer, add Connector and
C-sign-key in psk/sae credentials (i.e., cases where DPP AKM is not
enabled) for reconfiguration. Extend processing of such credentials in
wpa_supplicant network profile addition to handle this new case
correctly by not setting key_mgmt=DPP based on Connector being present,
but by looking at the actual akm value in the config object.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>