dmaengine: qcom_hidma: Check for driver register failure

While initializing the driver, the function platform_driver_register can
fail and return an error. Consistent with other invocations, this patch
returns the error upstream.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Acked-by: Sinan Kaya <okaya@kernel.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>