dmaengine: zynqmp_dma: Fix static checker warning

This patch fixes the below static checker warning
drivers/dma/xilinx/zynqmp_dma.c:973 zynqmp_dma_chan_probe()
        warn: was && intended here instead of ||?

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>