Staging: brcm80211: remove forgotten undef

I forgot to remove the float undefs in typedef.h from previous patches,
this fixes this issue.

Cc: Brett Rudley <brudley@broadcom.com>
Cc: Henry Ptasinski <henryp@broadcom.com>
Cc: Nohee Ko <noheek@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>