Adding /odm support

/odm partition isn't mandatory and the following symlinks will exist on
a device without /odm partition.

  /odm/app ->/vendor/odm/app
  /odm/bin ->/vendor/odm/bin
  /odm/etc ->/vendor/odm/etc
  /odm/firmware ->/vendor/odm/firmware
  /odm/framework ->/vendor/odm/framework
  /odm/lib -> /vendor/odm/lib
  /odm/lib64 -> /vendor/odm/lib64
  /odm/overlay -> /vendor/odm/overlay
  /odm/priv-app -> /vendor/odm/priv-app

This CL allows all domains to access the symlinks, also removes the
Treble compliance neverallows on them because the actual restrictions
should apply to the real path directly.

Bug: 70678783
Test: boot a device
Change-Id: If1522780a13710d8a592272dc688685cbae29f52
(cherry picked from commit dd6efea2)