test: ram_context_for_isr: exclude imx943 m33

i.MX943 M33 supports multi-level interrupt with NUM_IRQS 405.
Current ram_context_for_isr test does not cover multi-level interrupt.
So exclude i.MX943 M33.

Signed-off-by: Yangbo Lu <[email protected]>

Author: yangbolu1991

tests/application_development/ram_context_for_isr/testcase.yaml

@@ -11,3 +11,5 @@ tests:
       - mps3/corstone310/fvp
       - mps4/corstone315/fvp
       - mps4/corstone320/fvp
+      - imx943_evk/mimx94398/m33
+      - imx943_evk/mimx94398/m33/ddr