adm8211: remove SSID code

Since adm8211 currently doesn't implement IBSS mode anyway,
it can't be using the SSID. And if/when it does implement
IBSS mode, we'll have to see how to make it beacon anyway.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>