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[DEVMEM2] update devmem2 to latest version

Alessandro Pecugi requested to merge ap/devmem2 into kirkstone

Import devmem2_2.0.bb from meta-oe: https://git.openembedded.org/meta-openembedded/tree/meta-oe/recipes-support/devmem2/devmem2_2.0.bb?h=master

The new version has two advantages:

  • uses fixed-width integer types (uint32_t, uint64_t) and strict alignment for memory operations, and this prevents a memory bus error when trying to read "unaligned" registers on e.g. rk3568 and rk3399
  • supports the l type (64 bits)

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