linux-postmarketos-exynos4: upgrade to 6.4.2

Administratorrequested to merge
newbyte/exynos4-6.4.2 into master

Tested on

  • samsung-i9100
  • samsung-m0
  • samsung-p4note
  • odroid-u2

I will add other devices if test results for them are left as comments in this MR. The two mentioned above are the only ones I personally can test.

Edited by Administrator

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