spi/amba-pl022: work in polling or interrupt mode if pl022_dma_probe fails

If pl022_dma_probe fails, we can try to transfer data in polling or interrupt
mode. Also, set platform_info->enable_dma to 0, so that no other code tries to
use dma.

Signed-off-by: Viresh Kumar <[email protected]>
Acked-by: Linus Walleij <[email protected]>
Signed-off-by: Grant Likely <[email protected]>
1 file changed