initial tag for e1_tracer firmware

1. 3edf9dd gateware/icE1usb: Fix readback of E1 led misc register by Sylvain Munaut · 3 years, 9 months ago
2. 205a131 gateware/icE1usb{,-proto}: Make PDM registers write-only by Sylvain Munaut · 3 years, 9 months ago
3. ff0ab3e gateware: Wrap capture/counter units and allow use of SB_MAC16 by Sylvain Munaut · 3 years, 9 months ago
4. bd83e53 gateware/icE1usb: Initial import of production hardware gateware by Sylvain Munaut · 3 years, 10 months ago