SIE.yaml: add known u-boot limitations

The U-Boot QueryVariableInfo() implementation does not check properly for
all invalid inputs conditions instead of delegating to StMM.

Add a rule to override the result as "known u-boot limitation" in those
cases.

Link: https://lore.kernel.org/u-boot/20230126031512.17450-1-masahisa.kojima@linaro.org/


Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>