sepolicy: allow access to vndk-stable libs

Vndk-stable libs are system libs that are used by same process HALs.
Since same process HALs can be loaded to any process, so are vndk-stable
libs.

Bug: 37138502
Test: none, because the directory is currently empty and thus this is
no-op. sailfish builds and boots.

Change-Id: I67a2c8c2e4c3517aa30b4a97dc80dc2800e47b5a
diff --git a/private/file_contexts b/private/file_contexts
index 83792ed..f6e8e6b 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -266,6 +266,8 @@
 
 /(vendor|system/vendor)/lib(64)?/egl(/.*)?     u:object_r:same_process_hal_file:s0
 
+/(vendor|system/vendor)/lib(64)?/vndk-stable(/.*)? u:object_r:vndk_stable_file:s0
+
 # TODO: b/36790901 move this to /vendor/etc
 /(vendor|system/vendor)/manifest.xml           u:object_r:vendor_configs_file:s0
 /(vendor|system/vendor)/app(/.*)?              u:object_r:vendor_app_file:s0