Add support for Cr50 (Chromebook CCD)

[phcoder]

No description provided.

[kai-morich]

please provide some references, e.g. where and how this can be used

[phcoder]

please provide some references, e.g. where and how this can be used

This is explained at https://chromium.googlesource.com/chromiumos/third_party/hdctools/+/HEAD/docs/ccd.md#raw-access

This is mostly raw access and gives access to cr50 console, serial console and EC console. I use it to debug coreboot on my Chromebook.

[kai-morich]

please do not implement unsupported control line methods and but add UnsupportedOperationException stubs similar to GsmModemSerialDriver.
please add above link into the sourcefile.
When googeling for Cr50, users will not find related info. What about naming this driver ChromiumOsCcd ?

[phcoder]

Done with stubs and renamed to ChromeCcd

[kai-morich]

the build failed, please add missing method