soundwire: intel: export intel_resume_child_device

We will resume each child in the next patch, and
intel_resume_child_device() will be used.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20240410023438.487017-4-yung-chuan.liao@linux.intel.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>