Vendor tree changes for new ADI-sourced kernel

- Devicetree changes:
  - Disable Xilinx AXI-DMA
  - Remove vestigial AXI-GPIO
  - Add ADI DMAC for SDRDC: 4 channels for 2x AD9361
  - Remove GPIO-based SPI, use hard-IP core instead
  - Correct spelling on spi_shim entries
  - Max speed aligned with bare-metal test code at 5.2MHz
- Enable new ADI DMAC drivers in kernel config
- Align xparameters.h with PetaLinux working branch