fw/e1-tracer: Import firmware for the E1 tracer board

Some more code could probably be unified with the "normal" usb E1 adapter
to both reduce code duplication but also offer 'sniff' function to the
E1 adapter.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/firmware/ice40-riscv/e1-tracer/usb_str_app.txt b/firmware/ice40-riscv/e1-tracer/usb_str_app.txt
new file mode 100644
index 0000000..7f325e6
--- /dev/null
+++ b/firmware/ice40-riscv/e1-tracer/usb_str_app.txt
@@ -0,0 +1,8 @@
+0000000000000000
+osmocom
+e1-tracer
+Main
+E1
+Console (control)
+Console (data)
+DFU runtime