~ruther/vhdl-spi-2

ref: 94410b0e9f2ca2e0fdf37df9c565150784b99655 vhdl-spi-2/hdl_spi/tests/Makefile -rw-r--r-- 707 bytes 
chore: add ghdl support vhdl2008 arg

chore: few updates

feat: implement initial hdl_spi