firmware/ice40-riscv/e1-tracer: Remove CDC descriptors

This was never used and doesn't really belong here, this was just
an example descriptor in the original firmware this is based on.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: Ic72c991eb7a566b227484c7cde2c305d58202219
2 files changed