linux-postmarketos-qcom-msm8994: upgrade to 6.1.2

New features:

• msm8994-huawei-angler: Add sdhc1 definition (internal SD card).

Backporting 3 patches:

• 0001-arm64-dts-msm8992-bullhead-add-memory-hole-region.patch fixes bullhead boot since 6.0-rc1, already in qcom tree

• 0002-arm64-dts-qcom-msm8992-bullhead-Fix-cont_splash_mem-.patch memory fix, likely to be merged

• 0003-arm64-dts-qcom-msm8992-bullhead-Disable-dfps_data_me.patch memory fix, likely to be merged

• 0004-arm64-dts-qcom-msm8992-Don-t-use-sfpb-mutex.patch memory fix, likely to be merged

• 0005-arm64-dts-msm8994-angler-fix-the-memory-map.patch fixes angler reset during starting services in rootfs, likely to be merged

Remove all backported commits from newer versions.

While at it, remove various CONFIG_NET_VENDOR_.* and CONFIG_MSM_.* and CONFIG_.*_QCOM_.* for other SOCs.