Staging: rtl8192u: Remove TRUE and FALSE macros

Remove TRUE and FALSE boolean macros, since Linux kernel has already a
boolean type, bool, defined in linux/stddef.h

Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>