linux-postmarketos-allwinner: upgrade to 6.11.0_git20240915 (MR 5669)

- 0012-ARM-dts-allwinner-sun5i-a13-pocketbook-614-plus-Add-.patch

  The dts added by this patch is now present in upstream, so this patch has
  been removed. Note that the upstream dts has differences from the one that
  this patch added.

- Set myself as primary maintainer since Jan has been inactive for
  many months now.