Improve DMA configuration
- improve DMA configuration for stm32mp-t10xx-k boards
- update documentation
Related issue https://git.kontron-electronics.de/sw/ked/plan/plan-yocto/-/issues/964
Edited by Eberhard Stoll
Related issue https://git.kontron-electronics.de/sw/ked/plan/plan-yocto/-/issues/964