samples: add support for i.MX8QM and i.MX8QXP DSP core in openamp_rsc_table

Add the dts and config overlay for the two boards in order
to have the openamp_rsc_table sample working on
HiFi4 DSP from i.MX8QM and i.MX8QXP.

Since these two are similar, use a snippet.

Therefore, to compile the sample we use:
west build -p -b imx8qm_mek/mimx8qm6/adsp -S nxp-openamp-imx8-adsp
-s samples/subsys/ipc/openamp_rsc_table/

Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>

Author: iuliana-prodan

samples/subsys/ipc/openamp_rsc_table/snippets/nxp-openamp-imx8-adsp.conf

@@ -0,0 +1,5 @@
+CONFIG_LOG_PRINTK=n
+CONFIG_IPM_IMX_MAX_DATA_SIZE_16=n
+CONFIG_IPM_IMX_MAX_DATA_SIZE_4=y
+CONFIG_OPENAMP_WITH_DCACHE=y
+CONFIG_IPM_IMX_FW_READY_REPLY=y

samples/subsys/ipc/openamp_rsc_table/snippets/nxp-openamp-imx8-adsp.overlay

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2024 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	chosen {
+		/*
+		 * shared memory reserved for the inter-processor communication
+		 */
+		zephyr,ipc_shm = &dspsram3;
+		zephyr,ipc = &mailbox0;
+	};
+
+	dspsram3: memory@942f0000 {
+		compatible = "mmio-sram";
+		reg = <0x942f0000 0x110000>;
+	};
+};
+
+&mailbox0 {
+	status = "okay";
+};

samples/subsys/ipc/openamp_rsc_table/snippets/snippet.yml

@@ -0,0 +1,6 @@
+name: nxp-openamp-imx8-adsp
+boards:
+  /imx8qxp_mek\/mimx8qx6\/adsp|imx8qm_mek\/mimx8qm6\/adsp/:
+    append:
+      EXTRA_DTC_OVERLAY_FILE: nxp-openamp-imx8-adsp.overlay
+      EXTRA_CONF_FILE: nxp-openamp-imx8-adsp.conf