Split mac_permissions.xml into plat and non-plat components.

Bug: 31363362
Test: Bullhead and Sailfish both build and boot w/out new denials.
Change-Id: Id7e29ec09510741c4e925231401a6de81704fbf0
diff --git a/target/product/embedded.mk b/target/product/embedded.mk
index 78b61a6..48916b2 100644
--- a/target/product/embedded.mk
+++ b/target/product/embedded.mk
@@ -80,7 +80,8 @@
 # SELinux packages
 PRODUCT_PACKAGES += \
     file_contexts.bin \
-    mac_permissions.xml \
+    nonplat_mac_permissions.xml \
+    plat_mac_permissions.xml \
     property_contexts \
     seapp_contexts \
     selinux_version \