wpa_supplicant: bump to version 2.1

Now with 802.11ac and P2P support.

CONFIG_LIBNL32 was a hidden option so switch to ENABLE/DISABLE now.
CONFIG_DRIVER_ATMEL was dropped.
CONFIG_DELAYED_MIC is no longer optional.
CONFIG_AP was also hidden so also switch to ENABLE/DISABLE.
CONFIG_EAP_* now blindly enabled instead of doing one per each.

P2P support is unified with the AP mode config knob since it's the more
likely scenario and share code between them.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>