hostapd: Extend global control interface notifications

hostapd: Extend global control interface notifications

Previously, hostapd sent only WPA_MSG_ONLY_GLOBAL type notifications to
the global control interface and all other notifications to
per-interface control interface. Extend this by making it similar to
wpa_supplicant global control interface notifications handling. With
this hostapd now sends all notifications except WPA_MSG_NO_GLOBAL to the
global control interface. In addition, WPA_MSG_PER_INTERFACE type
messages will be prefixed with "IFNAME=<interface name> " while sending
to the global control interface to indicate that the message is
interface specific.

Signed-off-by: Veerendranath Jakkam <vjakkam@codeaurora.org>