openamp: resource table: fixes resource table for ram_console section

in commit 1cd37f2 the global ram console buffer was replaced
with a pointer. This didn't work with the OpenAMP resource table
anymore (zephyrproject-rtos#75656).

Signed-off-by: Simon Maurer <mail@maurer.systems>

Author: Simon Maurer

lib/open-amp/resource_table.c

@@ -29,7 +29,7 @@
 #include <zephyr/kernel.h>
 #include <resource_table.h>
 
-extern char ram_console[];
+extern char ram_console_buf[];
 
 #define __resource Z_GENERIC_SECTION(.resource_table)
 
@@ -68,7 +68,7 @@ static struct fw_resource_table __resource resource_table = {
 #if defined(CONFIG_RAM_CONSOLE)
 	.cm_trace = {
 		RSC_TRACE,
-		(uint32_t)ram_console, CONFIG_RAM_CONSOLE_BUFFER_SIZE, 0,
+		(uint32_t)ram_console_buf, CONFIG_RAM_CONSOLE_BUFFER_SIZE, 0,
 		"Zephyr_log",
 	},
 #endif