acpi: Create a common method to add DmaProperty

Create a common method to add DmaProperty.

BUG=b:259716145
TEST=Verified SSDT on google/osiris.

Signed-off-by: Kapil Porwal <kapilporwal@google.com>
Change-Id: I75b3f22ad29f90f3c3b251bd0d70bae9d75f71fe
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70022
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/acpi/acpi_device.h

@@ -588,4 +588,13 @@ void acpi_dp_write(struct acpi_dp *table);
  */
 void acpi_device_write_pci_dev(const struct device *dev);
 
+/*
+ * Helper function to add DmaProperty to _DSD in the current scope.
+ *
+ * dsd - Pointer to a _DSD object.
+ *       Append to existing _DSD object if not NULL.
+ *       Create new _DSD object and flush it if NULL.
+ */
+void acpi_device_add_dma_property(struct acpi_dp *dsd);
+
 #endif /* __ACPI_ACPI_DEVICE_H__ */