samples/llext/modules: sample.yaml fixes

Apply cleanups suggested by Anas in a Github discussion to the
sample.yaml file.

Signed-off-by: Luca Burelli <l.burelli@arduino.cc>

samples/subsys/llext/modules/sample.yaml

@@ -1,28 +1,14 @@
 common:
   tags: llext
-  arch_allow:
-    - arm
-    - xtensa
-  platform_exclude:
-    # platforms with active issues
-    - apollo4p_evb            # See #73443
-    - apollo4p_blue_kxr_evb   # See #73443
-    - numaker_pfm_m487        # See #63167
-    - s32z2xxdc2/s32z270/rtu0 # See commit 18a0660
-    - s32z2xxdc2/s32z270/rtu1 # See commit 18a0660
-    # platforms that are always skipped by the runtime filter
-    - qemu_arc/qemu_arc_em
-    - qemu_arc/qemu_arc_hs
-    - qemu_arc/qemu_arc_hs/xip
-    - qemu_arc/qemu_arc_hs5x
-    - qemu_arc/qemu_arc_hs6x
-    - qemu_cortex_m0
-    - qemu_xtensa/dc233c/mmu
-  integration_platforms:
+  platform_allow:
     - qemu_cortex_a9          # ARM Cortex-A9 (ARMv7-A ISA)
     - qemu_cortex_r5          # ARM Cortex-R5 (ARMv7-R ISA)
     - mps2/an385              # ARM Cortex-M3 (ARMv7-M ISA)
     - mps2/an521/cpu0         # ARM Cortex-M33 (ARMv8-M ISA)
+    - qemu_xtensa
+  integration_platforms:
+    - qemu_xtensa
+    - mps2/an385
   harness: console
 
 sample:
@@ -31,7 +17,6 @@ sample:
 
 tests:
   sample.llext.modules.module_build:
-    filter: not CONFIG_MPU and not CONFIG_MMU and not CONFIG_SOC_SERIES_S32ZE
     extra_configs:
       - CONFIG_HELLO_WORLD_MODE=m
       # Disabling MPU is the most compatible option. If the target supports