UPSTREAM: GPT: create block device for sandbox testing

Provide a Python function that creates a small block device for the
purpose of testing the cmd/gpt.c or cmd/part.c functions in the u-boot
sand

UPSTREAM: GPT: create block device for sandbox testing

Provide a Python function that creates a small block device for the
purpose of testing the cmd/gpt.c or cmd/part.c functions in the u-boot
sandbox.

Change-Id: I620c2f97c7b6533d8cb607e365e719246cdb7acd
Signed-off-by: Alison Chaiken <alison@peloton-tech.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
(cherry picked from commit bf6d76b84ae13b463c0dca556118047e2d046f33)

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