Merge pull request #1 from PeterCxy/patch-find-mmcblk

use `find` to match mmcblk partitions

If no volume button has been pressed, then wait in shell

Additional partitions to mount

[input-waiter] some devices may have VolumeUP and VolumeDown on different devices

wip++

Also provide skip_mount.cfg for Android 10 first stage init

Additional WIP: can read volume buttons to decide to boot on internal or sdcard, can boot from sdcard. Generates a ramdisk ext4 to have proper SELinux context

Include e2fsdroid and mke2fs

Add input-waiter to read volume buttons

Add dmctl from Android, built statically

Add linear-map, a tool to generate dm-linear target from a file

Remove sdcard from fstab to prevent concurrent access

Try to look for a system image on SDCard

Ignore hung tasks that might be waiting for Android userspace