guid-tool.yaml: add i.MX8M Plus EVK GUID
The NXP i.MX8M Plus EVK is certified for SystemReady IR 2.0 (with SIE);
keep track of its GUID accordingly.
Signed-off-by: 
Vincent Stehlé <vincent.stehle@arm.com>
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The NXP i.MX8M Plus EVK is certified for SystemReady IR 2.0 (with SIE);
keep track of its GUID accordingly.
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>