Add xc7k70t and small fixes for xc7k160t

[hansfbaier]

I just got this very affordable Kintex 70T board:
https://www.aliexpress.com/item/1005005572549665.html
I did not try spi over JTAG yet.
the default cmake / make / make install did not build it.
I also saw there were some entries missing for the 160t for consistency.

Let me know, what you think.

[trabucayre]

Applied. Thanks @hansfbaier
spiOverJtag bitstreams are not automatically built, you have to run make spiOverJtag_xc7k70tfbg676.bit.gz into spiOverJtag directory.
Feel free to add the board too :)

[hansfbaier]

Thanks!

$ make spiOverJtag_xc7k70tfbg676.bit.gz
./build.py xc7k70tfbg676
make[1]: Entering directory '/devel/src/openFPGALoader/spiOverJtag/tmp_xc7k70tfbg676'
make[1]: *** No rule to make target '/devel/src/openFPGALoader/spiOverJtag/constr_xc7k_fbg676.xdc', needed by 'spiOverJtag.xpr'.  Stop.
make[1]: Leaving directory '/devel/src/openFPGALoader/spiOverJtag/tmp_xc7k70tfbg676'

How are the constraint files created? What am I missing here?

[hansfbaier]

I don't think adding the board has much value, because it does not have an onboard JTAG adapter.