dmaengine: sun6i: Add debug messages for cyclic DMA prepare

dmaengine: sun6i: Add debug messages for cyclic DMA prepare

The driver already has debug messages for memcpy and linear transfers,
but is missing them for cyclic transfers.

Cyclic transfers are one of the main uses of the DMA controller, used
for audio data transfers. And since these are likely the first DMA
peripherals to be enabled, it helps to have these debug messages.

Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Chen-Yu Tsai <wens@kernel.org>
Link: https://patch.msgid.link/20251221064754.1783369-1-wens@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>