dmaengine updates for v5.7-rc1

  - Core:
    - Some code cleanup and optimization in core by Andy
    - Debugfs support for displaying dmaengine channels by Peter

  - Drivers:
    - New driver for uniphier-xdmac controller
    - Updates to stm32 dma, mdma and dmamux drivers and PM support
    - More updates to idxd drivers
    - Bunch of changes in tegra-apb driver and cleaning up of pm functions
    - Bunch of spelling fixes and Replace zero-length array patches
    - Shutdown hook for fsl-dpaa2-qdma driver
    - Support for interleaved transfers for ti-edma and virtualization
      support for k3-dma driver
    - Support for reset and updates in xilinx_dma driver
    - Improvements and locking updates in at_hdma driver
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