dts: bindings: regulator: add nordic,nrf53x-regulator-hv

nRF53X HV regulator differs from eg nRF52X as it offers a silent mode
option. For this reason, a new compatible is used, even if now such
capability is not exposed yet.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

dts/bindings/regulator/nordic,nrf53x-regulator-hv.yaml

@@ -0,0 +1,20 @@
+# Copyright (c), 2024 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+description: |
+  Nordic nRF53X regulator (high voltage stage of the main supply)
+
+compatible: "nordic,nrf53x-regulator-hv"
+
+include:
+  - name: base.yaml
+  - name: regulator.yaml
+    property-allowlist:
+      - regulator-name
+
+properties:
+  reg:
+    required: true
+
+  regulator-name:
+    required: true