Use tcl script instead of static xmls for the interface.
Easier to maintain and are not gitignored.
Rename spi_master to spi_engine because every interface should be
prefixed by the IP name; in this case, spi_engine.
Also, remove interface/*.sv files on make clean and git ignore them.
Signed-off-by: Jorge Marques <jorge.marques@analog.com>
The SPI Engine cores were named directly inside the script and this
would mean that for multiple SPI Engine instances IPs with the same
name would appear. These updates will introduce the hierarchy name
into the name given to the cores and will therefore allow for
multiple instances of SPI Engine to be added to the same Xilinx
project.
Projects which use spi_engine.tcl will be updated to account for
these changes.