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[Armbian build PR] - rockchip64: enable DMC on Orange Pi 4 LTS


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Description

Orange Pi 4 LTS has DDR4 memory banks that always run at full speed. This PR enables the DMC driver in kernel 6.1 to lower the frequency to reduce power usage during idle periods. Benchmarks with a digital multimeter show that the power usage decreases by 200mW when the board is idling.

Jira reference number AR-1584

How Has This Been Tested?

This is a pre-armbian-next era patch and has been tested to be fully functional. I rebased it successfully on main branch, but requires to be tested not to break the compilation.

  • [ ] compile to produce kernel deb packages

Checklist:

  • [x] My code follows the style guidelines of this project
  • [x] I have performed a self-review of my own code
  • [x] I have commented my code, particularly in hard-to-understand areas
  • [x] I have made corresponding changes to the documentation
  • [x] My changes generate no new warnings
  • [x] Any dependent changes have been merged and published in downstream modules

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