screenshot-tests: Add initial screenshot test png files for core-image-sato

This is an initial commit of png's we can use to test qemu image testing
against.

Also add symlinks for core-image-sato-sdk

[RP: Add symlinks and missing image]
(From OE-Core rev: 06b7a8c02fbf89258034a0a258efc0bd23902f03)

Signed-off-by: Eilís 'pidge' Ní Fhlannagáin <pidge@baylibre.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/files/screenshot-tests/core-image-sato-sdk-qemuarm.png

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+core-image-sato-qemuarm.png

meta/files/screenshot-tests/core-image-sato-sdk-qemuarm64.png

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+core-image-sato-qemuarm64.png

meta/files/screenshot-tests/core-image-sato-sdk-qemumips.png

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+core-image-sato-qemumips.png

meta/files/screenshot-tests/core-image-sato-sdk-qemumips64.png

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+core-image-sato-qemumips64.png

meta/files/screenshot-tests/core-image-sato-sdk-qemuppc.png

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+core-image-sato-qemuppc.png

meta/files/screenshot-tests/core-image-sato-sdk-qemuriscv64.png

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+core-image-sato-qemuriscv64.png

meta/files/screenshot-tests/core-image-sato-sdk-qemux86-64.png

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+core-image-sato-qemux86-64.png

meta/files/screenshot-tests/core-image-sato-sdk-qemux86.png

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+core-image-sato-qemux86.png