test: cmd: fdt: Test fdt print and list

test: cmd: fdt: Test fdt print and list

Add 'fdt print' and 'fdt list' test which works as follows:
- Create fuller FDT, map it to sysmem
- Print the entire FDT, parts of the FDT and select properties
- Compare output from the print or list

The test case can be triggered using:
"
./u-boot -Dc 'ut fdt'
"
To dump the full output from commands used during test, add '-v' flag.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Simon Glass <sjg@chromium.org>