~ruther/vhdl-i2c

ref: 987035cd215d71ee109cae9038fe55d6cf83ea76 vhdl-i2c/tb/mcu_slave d---------
fix: issues on master
fix: mcu slave tbs, wait for sync rst
feat: synchronize reset in mcu slave tops
tests: add regs mcu_slave test
refactor: get rid of sda, scl overrides, drive sda, scl directly
refactor: use 'H' std_logic state instead of custom pull up type
tests: add possibility to check sda stability in mcu_slave
tests: add mcu_slave counter tb
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