snippets: matter: Use boards instead of wildcards for matter-debug

We need to use exact boards for matter-debug snippet. If a user
wants to add it to their board, they must increase UART speed
manually. Added the update in the docs as well.

Signed-off-by: Arkadiusz Balys <[email protected]>

Author: ArekBalysNordic

doc/nrf/protocols/matter/getting_started/advanced_kconfigs.rst

@@ -354,3 +354,8 @@ For example, for the ``nrf52840dk/nrf52840`` board target and the :ref:`matter_l
    :class: highlight
 
    west build -b nrf52840dk/nrf52840 -- -Dlock_SNIPPET=matter-debug
+
+.. note::
+
+  You can increase the UART speed using this snippet only for Nordic Development Kits.
+  If you want to use the snippet for your custom board, you need to adjust the UART speed manually.

snippets/matter-debug/snippet.yml

@@ -3,21 +3,18 @@ append:
   EXTRA_CONF_FILE: matter_debug.conf
 
 boards:
-  /.*nrf52840.*/:
+  nrf52840dk/nrf52840:
     append:
       EXTRA_DTC_OVERLAY_FILE: boards/nrf52840dk_nrf52840.overlay
-  /.*nrf5340.*/:
+  nrf5340dk/nrf5340/cpuapp:
     append:
       EXTRA_DTC_OVERLAY_FILE: boards/nrf5340dk_nrf5340_cpuapp.overlay
   nrf7002dk/nrf5340/cpuapp:
     append:
       EXTRA_DTC_OVERLAY_FILE: boards/nrf7002dk_nrf5340_cpuapp.overlay
-  thingy53/nrf5340/cpuapp:
-    append:
-      EXTRA_DTC_OVERLAY_FILE: boards/nrf5340dk_nrf5340_cpuapp.overlay
-  /.*nrf54l.*/:
+  /nrf54l15dk.*/:
     append:
       EXTRA_DTC_OVERLAY_FILE: boards/nrf54l15dk_nrf54l15_cpuapp.overlay
-  /.*nrf54h20.*/:
+  nrf54h20dk/nrf54h20/cpuapp:
     append:
       EXTRA_DTC_OVERLAY_FILE: boards/nrf54h20dk_nrf54h20_cpuapp.overlay