samples/tests: Rename numaker boards

Renames boards due to hwmv2 changes

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>

samples/subsys/llext/shell_loader/sample.yaml

@@ -5,7 +5,7 @@ common:
     - xtensa
   filter: not CONFIG_MPU and not CONFIG_MMU and not CONFIG_SOC_SERIES_S32ZE
   platform_exclude:
-    - numaker_pfm/m487 # See #63167
+    - numaker_pfm_m487 # See #63167
 sample:
   description: Loadable extensions with shell sample
   name: Extension loader shell

tests/drivers/charger/sbs_charger/testcase.yaml

@@ -19,7 +19,7 @@ tests:
       - hifive_unmatched
       - rcar_h3ulcb/r8a77951/a57
       - rcar_salvator_xs
-      - numaker_pfm/m467
+      - numaker_pfm_m467
   drivers.charger.sbs.emulated_64_bit_i2c_addr:
     tags:
       - drivers

tests/subsys/llext/hello_world/testcase.yaml

@@ -4,7 +4,7 @@ common:
     - arm
     - xtensa
   platform_exclude:
-    - numaker_pfm/m487 # See #63167
+    - numaker_pfm_m487 # See #63167
 tests:
   llext.simple.readonly:
     arch_exclude: xtensa # for now