samples: drivers: mbox: fix adp_xc7k/ae350 configuration and overlay

This commit fixes the following issues for adp_xc7k/ae350
  1. Incorrect copyright due to copy-paste error
  2. Separate RAM region for the host and remote clusters
  3. Allocate hart 0 for host and hart 1 for remote cluster
  4. Use mbox channel 9, 10 for the sample, leaving channel/irq source
     1 ~ 8 for ae350 8-core IPI

Signed-off-by: Jimmy Zheng <jimmyzhe@andestech.com>

samples/drivers/mbox/boards/adp_xc7k_ae350.conf

@@ -1 +1,2 @@
 CONFIG_RV_BOOT_HART=0
+CONFIG_MP_MAX_NUM_CPUS=1

samples/drivers/mbox/boards/adp_xc7k_ae350.overlay

@@ -1,25 +1,16 @@
 /*
- * Copyright (c) 2019 Linaro Limited
- *
+ * Copyright (c) 2022 Andes Technology Corporation.
  * SPDX-License-Identifier: Apache-2.0
  */
 
 / {
-	chosen {
-		/*
-		 * shared memory reserved for the inter-processor communication
-		 */
-		zephyr,sram = &sram;
-	};
-
-	sram: memory@0 {
-		compatible = "mmio-sram";
-		reg = <0x00000000 0x10000000 >;
-	};
-
 	mbox-consumer {
 		compatible = "vnd,mbox-consumer";
-		mboxes = <&mbox 1>, <&mbox 0>;
+		mboxes = <&mbox 9>, <&mbox 10>;
 		mbox-names = "tx", "rx";
 	};
 };
+
+&dram {
+	reg = <0x00000000 0x10000000>;
+};

samples/drivers/mbox/remote/boards/adp_xc7k_ae350.conf

@@ -0,0 +1,2 @@
+CONFIG_RV_BOOT_HART=1
+CONFIG_MP_MAX_NUM_CPUS=1

samples/drivers/mbox/remote/boards/adp_xc7k_ae350.overlay

@@ -1,13 +1,20 @@
 /*
- * Copyright (c) 2019 Linaro Limited
- *
+ * Copyright (c) 2022 Andes Technology Corporation.
  * SPDX-License-Identifier: Apache-2.0
  */
 
 / {
 	mbox-consumer {
 		compatible = "vnd,mbox-consumer";
-		mboxes = <&mbox 0>, <&mbox 1>;
+		mboxes = <&mbox 10>, <&mbox 9>;
 		mbox-names = "tx", "rx";
 	};
 };
+
+&cpu0 {
+	status = "disabled";
+};
+
+&dram {
+	reg = <0x10000000 0x10000000>;
+};