Staging: brcm80211: remove floating point typedefs

It's not ever used, so remove the typedef.  Floating point isn't used
in the kernel, so this could never be an issue here.

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>