dmaengine: k3dma: add missing clk_disable_unprepare() on error in k3_dma_probe()

Add the missing clk_disable_unprepare() before return
from k3_dma_probe() in the error handling case.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>