hostapd: add 'driver' command support (under ANDROID flag)

[Garcia, Jeremie]

Hello all,

Please find attached 2 patches to make hostapd support "driver" command in an Android context.
It is a mirror of what has been done for wpa_supplicant.
First patch address the ctrl_iface while the second one enables it from hostapd_cli.

PS: sorry for the patch submission format since not able to use "git send-mail"

Best regards
Jeremie
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