drm: xlnx: pl_disp: Fix error handling

drm: xlnx: pl_disp: Fix error handling

This fixes multiple error handling sequences. First, when component_add()
fails in probe, the requested dma channels should be released. Then,
in remove, the clean up sequence should be reverse order, thus, call
component_del() before dma channel release. Last, the all dma channels
should be release without checking the active flag, then use
dmaengine_terminate_sync() as dmaengine_terminate_all() is deprecated.

While at it, add a print on probe success.

Signed-off-by: Hyun Kwon <hyun.kwon@xilinx.com>
Tested-by: Saurabh Sengar <saurabhs@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>