This updates google-crosshatch's downstream kernel to Lineage 17.1's
version (4.9.200, shared with Lineage's Pixel 3a port).
The newer kernel is needed because this device's kernel requires a
matching dtbo partition. The previous kernel would fail to boot with an
Android 10 dtbo partition.
Two patches were removed: Android 10's bootloader no longer passes the dm
or skip_initramfs boot arguments because of the new dynamic partitions
(https://source.android.com/devices/tech/ota/dynamic_partitions/ab_legacy).
Changes from the LineageOS kernel config:
https://gist.github.com/zhuowei/89b4135ff27e88f5a3dd3e4bf3cd31ab
Tested by booting to USB networking and debug-shell: I have not tested
flashing full pmOS using this kernel yet.
For some reason, on this kernel, when pmOS can't find system partitions
during the "Trying to mount subpartitions for 10 seconds..." stage, it
waits for 70 seconds instead of 10 seconds. I'm not sure why. It does go
to debug-shell correctly after a minute.
[ci:skip-build]: already built successfully in CI
[skip-ci]: just downloading all kernel sources takes about one hour
and ollieparanoid wants to merge it now. This already ran
successfully with [ci:skip-build] and [ci:skip-vercheck].
Prepare for better device categorization by moving everything to testing
subdir first.
[skip-ci]: chicken-egg problem: passing pmaports CI depends on pmbootstrap MR
depends on this MR
Related: postmarketos#16
