DevicePathToText and DevicePathFromText Protocol

[supdrewin]

#400

[supdrewin]

This is the test used by previous PR #398 , but make it panic if the file_path is null (the child loaded from buffer should always panic).

Child:

Parent:

Run:

From the picture we can find the path is successfully converted by the Device Path to Text Protocol.

TODO: This protocol's functions allocated pool which means the callers should free the pool manually.

[nicholasbishop]

Thanks for the PR! I've left a couple comments inline. Also, it would be good to add some tests for these protocols to uefi-test-runner/src/proto/device_path.rs.

[supdrewin]

Thanks for the PR! I've left a couple comments inline. Also, it would be good to add some tests for these protocols to uefi-test-runner/src/proto/device_path.rs.

I add the test for both protocols now.

[nicholasbishop]

Looks good!