UPSTREAM: test: overlay: Add unit test for stacked overlay

Verify that stacked overlays work.

Change-Id: Id5c578db630bb34e952ca5176bb5ca9815bb0c0f
Signed-off-by: Pantelis Antoniou <pantelis.antonio

UPSTREAM: test: overlay: Add unit test for stacked overlay

Verify that stacked overlays work.

Change-Id: Id5c578db630bb34e952ca5176bb5ca9815bb0c0f
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
(cherry picked from commit ea28e488f743520f7f83b341f28818c32dae1ee3)

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