tests cmsis_dsp filtering: Do not run filtering.misc.fpu on mps3_an547

Merging 565c9376
exposed an issue in this test, which causes an assert in the
mps3_an547.
For more information check
https://github.com/zephyrproject-rtos/zephyr/issues/64387



The issue needs further analysis.
With this platform being an integration
platform for this test, it gets triggered in CI by unrelated
PRs, causing CI failures and blocking development.

As an interim measure, to unblock development in the main branch,
let's exclude this platform from this test.

This commit should be reverted once the underlaying issue is
indentified and addressed.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>