samples: openamp_rsc_table: use vendor-specific rsc table to reply to host

Update the imx8mp_evk_mimx8ml8_adsp board configuration to enable
vendor-specific resource table features instead of FW_READY reply
config.

Signed-off-by: Iuliana Prodan <[email protected]>

Author: iuliana-prodan

samples/subsys/ipc/openamp_rsc_table/boards/imx8mp_evk_mimx8ml8_adsp.conf

@@ -2,4 +2,7 @@ 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
+
+#vendor-specific resource table
+CONFIG_OPENAMP_VENDOR_RSC_TABLE=y
+CONFIG_OPENAMP_VENDOR_RSC_TABLE_FILE="nxp_resource_table.c"