~ruther/vhdl-spi-2

ref: 5c7a8bb412b0f4dc78f9b891819452e477869678 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