Regression tested on a HiSilicon D06

** Tags removed: verification-needed-disco
** Tags added: verification-done-disco

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https://bugs.launchpad.net/bugs/1839395

Title:
  Regressions in CMA allocation rework

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Disco:
  Fix Committed

Bug description:
  Introduced by the fixes for bug 1823753.

  [Impact]
  Crashes (as observed on a nigrogen8m device), and a potential memory leak.

  [Test Case]
  Regression tested only.

  [Fix]
  f46cc0152501e dma-contiguous: page-align the size in dma_free_contiguous()
  c6622a425acd1 dma-contiguous: do not overwrite align in dma_alloc_contiguous()

  [Regression Risk]
  Bugs in CMA code could lead to device driver errors/crashes.

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