device-<qcom-msm8916>: revert to msdos partition table for now

pmbootstrap 3.0.0 uses GPT partition table by default, which breaks booting on all the devices using the lk2nd bootloader. The current version of lk2nd supports GPT only for the eMMC, while subpartitions and SD cards must be partitioned with MBR. GPT support was present in the legacy branch of lk2nd, but was dropped at some point because of poor code quality.

Fix the regression for now by reverting back to the old msdos (MBR) partition table. We can revert this again later when lk2nd restores support for GPT.

Generated with:

$ for d in $(grep -R linux-postmarketos-qcom-msm8916 | grep -Eo 'device-[^/]+' | sort -u); do \
  echo -e '\n# lk2nd does not support GPT for subpartitions/SD cards yet\ndeviceinfo_partition_type="msdos"' \
  >> device/*/$d/deviceinfo && pmbootstrap checksum $d && pmbootstrap pkgver_bump $d; done