latona: Add basic SELinux policies

- Added basic sepolicy to allow device to boot (there's a bug that
  crashes the device without it)
- Added other sepolicies to fix denial and tighten processes
- Uses bind mount instead of symlink because file_contexts uses real
  path

  Ported basic SELinux policies from aries-common, adapted for latona board.
  TODO: Fix the policies for latona. Add permissions for the rest of devices (camera, gps, etc).

Change-Id: I0c518e780c79d2ed38838f90b7ad30fa29e3b55c
Signed-off-by: David Rodero <david@codiguiel.net>
latona: use selinux defconfig.

Change-Id: I7c41a2ce0880d92605c7cde618c8c7ebee8e4f7d
Signed-off-by: David Rodero <david@codiguiel.net>
latona: fixup SELinux policies.

Change-Id: I1c7db7200314b264607f7cedbfc86ffefd73b5e6
Signed-off-by: David Rodero <david@codiguiel.net>
latona: selinux: refine rild and pvr perms. (Changes from t1 device)

Change-Id: Id899d807beb446fe962af5160caa67fefa8d6447
Signed-off-by: David Rodero <david@codiguiel.net>
latona: refine sepolicies with changes from t1 device and add missing wpa_supplicant policy file.

Change-Id: Ie4a4ee078fa564930720af9e2f8d6ab17e573efc
Signed-off-by: David Rodero <david@codiguiel.net>