dm: test: Add test for part_get_info_by_type

Adds a test suite to ensure that part_get_info_by_type works correctly
by creating a hybrid GPT/MBR partition table and reading both.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
[trini: Add this on the other sandbox configs]
Signedd-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>