Do not remove init.recovery.*.rc in recovery root

When making recovery image, it removes init*.rc under recovery root,
then copies init.recovery.*.rc from normal root to recovery root.

However, init.recovery.*.rc shouldn't exist in normal root because it
is only needed for recovery mode.

This change removes init*.rc under recovery root as before but skips
removing init.recovery.*.rc. So in device/*/*.mk, we can just copy
init.recovery.*.rc to recovery root without coping it to normal root
directory.

Bug: 65570851
Test: normal/recovery boot sailfish, checks init.recovery.sailfish.rc
      only exists in recovery root.
Change-Id: I069596fe2192d9dcbbdf2b77079b93ede3ed39ae