staging: rtl8188eu: remove RFtype from struct HAL_VERSION

RFtype in struct HAL_VERSION duplicates rf_type in struct
hal_data_8188e, and does not change.  Remove it and the macros that test
it.

Signed-off-by: Jakub Sitnicki <jsitnicki@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>