Add basic defines for 5592 chip. It can not be enabled until
CONFIG_RT2800USB_RT55XX configuration option will be provided in the
Kconfig.
Signed-off-by: NStanislaw Gruszka <stf_xl@wp.pl>
Tested-by: NWanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>