linux-postmarketos-qcom-sdm845: upgrade to 6.13-rc2

just a plain rebase and bump. kiiinda late for 24.12 but I'm hopeful there's nothing major here so as long as folks are happy to give it a whirl it should be fine to include it.

cc @joelselvaraj @DylanVanAssche

Please try this out once CI passes! Testing instructions can be found here. Testing is done using the mrtest tool.

• Qualcomm Snapdragon 845/850 (SDM845/SDM850):
  • oneplus-enchilada (@Breakfastisready, @CarbonatedCaffeine, @antonok, @crowdtier, @dan, @fdlamotte, @panzersajt)
  • xiaomi-beryllium (@anjandev, @longnoserob, @panzersajt)