snippets: Add nordic-ppr-xip

This replacement for the `nordic-ppr-ram` snippet does the opposite:
enable PPR execution in place from MRAM.

Signed-off-by: Grzegorz Swiderski <grzegorz.swiderski@nordicsemi.no>

snippets/nordic-ppr-xip/README.rst

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+.. _nordic-ppr-xip:
+
+Nordic boot PPR snippet with execution in place (nordic-ppr-xip)
+################################################################
+
+Overview
+********
+
+This snippet allows users to build Zephyr with the capability to boot Nordic PPR
+(Peripheral Processor) from another core. PPR code is to be executed from MRAM,
+so the PPR image must be built for the ``xip`` board variant, or with
+:kconfig:option:`CONFIG_XIP` enabled.

snippets/nordic-ppr-xip/boards/nrf54h20dk_nrf54h20_cpuapp.overlay

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+/*
+ * Copyright (c) 2024 Nordic Semiconductor
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&cpuppr_ram3x_region {
+	status = "okay";
+};
+
+&cpuppr_vpr {
+	execution-memory = <&cpuppr_code_partition>;
+	/delete-property/ source-memory;
+};
+
+&uart135 {
+	status = "reserved";
+};

snippets/nordic-ppr-xip/nordic-ppr-xip.overlay

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+/*
+ * Copyright (c) 2024 Nordic Semiconductor
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&cpuppr_vpr {
+	status = "okay";
+};

snippets/nordic-ppr-xip/snippet.yml

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+name: nordic-ppr-xip
+append:
+  EXTRA_DTC_OVERLAY_FILE: nordic-ppr-xip.overlay
+
+boards:
+  nrf54h20dk/nrf54h20/cpuapp:
+    append:
+      EXTRA_DTC_OVERLAY_FILE: boards/nrf54h20dk_nrf54h20_cpuapp.overlay