dmaengine: dw: Convert members to u32 in platform data

u32 is a type that is used for properties retrieval from DT.
With the type change it allows to clean up properties reading routine.

While at it, order the fields in way how they are parsed.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Tested-by: Serge Semin <fancer.lancer@gmail.com>
Link: https://lore.kernel.org/r/20210802184355.49879-2-andriy.shevchenko@linux.intel.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>