dmaengine: acpi: Drop unused devm_acpi_dma_controller_free()

After introduction a few years ago the devm_acpi_dma_controller_free()
was never used. Drop it.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20241007150436.2183575-2-andriy.shevchenko@linux.intel.com


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