doc: working_with_nrf: Add nrf54lm20 DK to npm13xx

Add nrf54lm20dk to npm1300 and npm1304 docs.

Signed-off-by: Audun Korneliussen <[email protected]>
(cherry picked from commit 6248a85)

Author: nordic-auko

doc/nrf/app_dev/device_guides/pmic/npm1300.rst

@@ -58,6 +58,11 @@ The following boards in the `Zephyr`_ open source project and in the |NCS| are c
      - PCA10156
      - | ``nrf54l15dk/nrf54l15/cpuapp``
      - --
+   * - :zephyr:board:`nrf54lm20dk`
+     - nPM1300 EK
+     - PCA10184
+     - | ``nrf54lm20dk/nrf54lm20a/cpuapp``
+     - --
    * - :zephyr:board:`nrf5340dk`
      - nPM1300 EK
      - PCA10095

doc/nrf/app_dev/device_guides/pmic/npm1304.rst

@@ -45,6 +45,11 @@ The following boards in the `Zephyr`_ open source project and in the |NCS| are c
      - | `Datasheet <nRF54L15 Datasheet_>`_
        | `Quick Start app`_
        | `User Guide <nRF54L15 DK User Guide_>`_
+   * - :zephyr:board:`nrf54lm20dk`
+     - nPM1304 EK
+     - PCA10184
+     - | ``nrf54lm20dk/nrf54lm20a/cpuapp``
+     - --
    * - :zephyr:board:`nrf5340dk`
      - nPM1304 EK
      - PCA10095