samples: subsys: llext: shell_loader: Exclude Renesas RZ/A2M

RZ/A2M requires MMU enabled. This sample disables MMU, so exclude the
platform.

Signed-off-by: Hoang Nguyen <hoang.nguyen.jx@bp.renesas.com>
Signed-off-by: Binh Nguyen <binh.nguyen.xw@renesas.com>

samples/subsys/llext/shell_loader/sample.yaml

@@ -6,6 +6,7 @@ common:
     - arm
     - xtensa
   filter: not CONFIG_MPU and not CONFIG_MMU and not CONFIG_SOC_SERIES_S32ZE
+    and not CONFIG_SOC_SERIES_RZA2M
   platform_exclude:
     # platforms with active issues
     - apollo4p_evb            # See #73443
@@ -21,6 +22,7 @@ common:
     - qemu_arc/qemu_arc_hs6x
     - qemu_cortex_m0
     - qemu_xtensa/dc233c/mmu
+    - rza2m_evk
 
 sample:
   description: Loadable extensions with shell sample