Add open-amp patch 0019 to extend fw_rsc_config with h2r_buf_addr
and r2h_buf_addr fields, allowing the host and remote sides to
specify buffer physical addresses through the resource table.
This enables splitting the shared memory pool into separate regions.
Also update open-amp.defs and open-amp.cmake to apply the new patch
during the open-amp build process.
Signed-off-by: Bowen Wang <wangbowen6@xiaomi.com>