ACPI: make acpi_create_platform_device() an external API

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
index 2bf9082..a3c89a1 100644
--- a/drivers/acpi/acpi_platform.c
+++ b/drivers/acpi/acpi_platform.c
@@ -113,3 +113,4 @@
 	kfree(resources);
 	return pdev;
 }
+EXPORT_SYMBOL_GPL(acpi_create_platform_device);