Split seapp_contexts into plat and nonplat components.

Bug: 33746381
Test: Device boots with no extra denials.
Change-Id: I2f0da92367851142e0d7df4afec8861ceaed9d3e
diff --git a/private/file_contexts b/private/file_contexts
index 80e1927..3fc8129 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -43,6 +43,8 @@
 /plat_sepolicy\.cil      u:object_r:rootfs:s0
 /property_contexts  u:object_r:property_contexts:s0
 /seapp_contexts     u:object_r:rootfs:s0
+/nonplat_seapp_contexts     u:object_r:rootfs:s0
+/plat_seapp_contexts     u:object_r:rootfs:s0
 /sepolicy           u:object_r:rootfs:s0
 /service_contexts   u:object_r:rootfs:s0