tests: posix: xsi_realtime: Exclude FVP SMP for minimal and picolibc for now

The xsi_realtime test with minimal and picolibc C libraries fails on FVP
SMP configurations. The test execution completes but reports failure,
distinct from both the timeout issues (lockfree, eventfd) and the newlib
spinlock validation failures.

Tests affected:
- portability.posix.xsi_realtime.minimal (failed)
- portability.posix.xsi_realtime.picolibc (failed)

The newlib variant was already disabled by the previous Kconfig change
that disables all newlib on FVP SMP.

Signed-off-by: Nicolas Pitre <[email protected]>

Author: Nicolas Pitre

tests/posix/xsi_realtime/testcase.yaml

@@ -21,6 +21,12 @@ common:
 tests:
   portability.posix.xsi_realtime: {}
   portability.posix.xsi_realtime.minimal:
+    platform_exclude:
+      # FVP SMP: test failure
+      - fvp_base_revc_2xaem/v8a/smp
+      - fvp_base_revc_2xaem/v8a/smp/ns
+      - fvp_base_revc_2xaem/v9a/smp
+      - fvp_base_revc_2xaem/v9a/smp/ns
     extra_configs:
       - CONFIG_MINIMAL_LIBC=y
   portability.posix.xsi_realtime.newlib:
@@ -30,5 +36,11 @@ tests:
   portability.posix.xsi_realtime.picolibc:
     tags: picolibc
     filter: CONFIG_PICOLIBC_SUPPORTED
+    platform_exclude:
+      # FVP SMP: test failure
+      - fvp_base_revc_2xaem/v8a/smp
+      - fvp_base_revc_2xaem/v8a/smp/ns
+      - fvp_base_revc_2xaem/v9a/smp
+      - fvp_base_revc_2xaem/v9a/smp/ns
     extra_configs:
       - CONFIG_PICOLIBC=y