this is needed for VXS integration in which hdlmake is used to generate
a list of files used, these failes are alter copied to a Visual Elite
based project

For the few peripherals where it was being used (eg. uart, spi, etc) the output port
has been renamed to "int_o".

The only peripheral that was not touched is "wb_eic.vhd", because this one is being used
by wbgen, and it would require users to update their wbgen tool as well. So, until a new
tool is introduced, wbgen-generated interrupt controllers will have an output port called
wb_int_o".

Signed-off-by: Dimitris Lampridis <Dimitris.Lampridis@cern.ch>

Signed-off-by: Dimitris Lampridis <Dimitris.Lampridis@cern.ch>

Signed-off-by: Dimitris Lampridis <Dimitris.Lampridis@cern.ch>

Now wb_spi has generic parameters to configure registers length and number of
spi slaves. Reason for that is to keep default configuration in the repository
but also allow to adjust settings for WR Switch synthesis (and save resources).