boards: nrf_bsim: Move ipc backend next to .data

To avoid possible linker warnings, when the linker may end up placing
this section in a segment with text and therefore with execute
permissions, with let's move it next to the .data section.

Signed-off-by: Alberto Escolar Piedras <[email protected]>

Author: aescolar

boards/native/nrf_bsim/ipc_backend.c

@@ -21,7 +21,7 @@
 #define DT_DRV_COMPAT zephyr_ipc_openamp_static_vrings
 
 #define DEFINE_BACKEND_BUFFER(i) \
-	NATIVE_SIMULATOR_IF \
+	NATIVE_SIMULATOR_IF_DATA \
 	char IPC##i##_shm_buffer[DT_REG_SIZE(DT_INST_PHANDLE(i, memory_region))];
 
 DT_INST_FOREACH_STATUS_OKAY(DEFINE_BACKEND_BUFFER)