spi: pl022: Only use DT-specified DMA channels

spi: pl022: Only use DT-specified DMA channels

When a platform is booted with devicetree and does not provide a
platform data structure, the driver creates one internally.  enable_dma
should not be set in this structure when creating it; the probe function
will set it later if DMA channels are specified via the devicetree.

Setting enable_dma = 1 when creating this internal platform data can
lead to pl022_dma_probe() finding bogus DMA channels (since there is no
channel filter specified) when no DMA channels are specified in the
devicetree.

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Acked-by: Dhruva Gole <d-gole@ti.com>
Link: https://lore.kernel.org/r/20230102160852.3090202-1-vincent.whitchurch@axis.com
Signed-off-by: Mark Brown <broonie@kernel.org>