hostapd: Android: Force group access to ctrl_iface directory

hostapd: Android: Force group access to ctrl_iface directory

Same fix as d49ea68284fdb8516d7e0903e526aac484c18c49 in
wpa_supplicant.

From original commit:

wpa_supplicant is started from /init.*.rc on Android and that seems
to be using umask 0077 which would leave the control interface
directory without group access. This breaks things since Wi-Fi
framework assumes that this directory can be accessed by other
applications in the wifi group. Fix this by adding group access even
if umask value would prevent this.

Signed-hostap: Pontus Fuchs <pontus.fuchs@gmail.com>