Actions Semi ARM64 changes for v5.5:

Most of the basic infrastructure is completed for the ARM64 S900 SoC.
It can now boot a distro from eMMC/uSD with mainline kernel. Below are
the changes for this cycle (only S900):

- Added MMC controller support for S900 SoC. There are 4 controllers in
  this SoC, each capable of accessing MMC cards as well as SDIO.
- Added onboard eMMC and uSD support for 96Boards Bubblegum96 board based
  on S900. Since the MMC driver is not capable of supporting SDIO currently,
  it is not enabled for now. And with the absence of PMIC support, fixed
  regulators are used to model the power supply.
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