ASoC: SOF: amd: Add support for IPC with a reply_size set to zero

Add support for IPC tx_message with a reply_size set to zero,
return zero when message reply_size is zero at acp_dsp_ipc_get_reply().

Signed-off-by: Venkata Prasad Potturu <venkataprasad.potturu@amd.com>
Link: https://lore.kernel.org/r/20230614103707.2246296-1-venkataprasad.potturu@amd.com


Signed-off-by: Mark Brown <broonie@kernel.org>