fs_mgr: overlay: resize other OTA partitions to zero to make space

If we do not have at least the minimum space to create a scratch
partition, let's resize the other partitions to zero to make the
space and try again.

Specify additional shared library dependencies for remount command.
margin_size could never be calculated because "scratch" partition
does not exist, so use super partition instead as argument to
GetBlockDeviceInfo.

Add a "Now reboot your device for settings to take effect" message
if the -R argument was not supplied.  Adjust some of the messages
to be clearer.

Manual test: On a full DAP device, resize or flash both a and b side
for system, vendor and product with fastboot to duplicate failure
conditions of limited space and check remount command resizes other
side partitions to mitigate.

Test: manual and adb_remount_test.sh
Bug: 131390072
Change-Id: I34c4a973f88a5e1e06b64af9589a84721dd1bbbd