Rename context names of zram properties

Moving from old bad name "exported*_prop".

Bug: 154885206
Bug: 155844385
Test: m selinux_policy
Change-Id: I21af42980e5e6e2c3cabea6c36825fa2836a55bc
diff --git a/private/system_server.te b/private/system_server.te
index e9f57f1..cd2fa78 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -683,6 +683,12 @@
 # Read the vendor property that indicates if Incremental features is enabled
 get_prop(system_server, incremental_prop)
 
+# Read ro.zram. properties
+get_prop(system_server, zram_config_prop)
+
+# Read/write persist.sys.zram_enabled
+set_prop(system_server, zram_control_prop)
+
 # Create a socket for connections from debuggerd.
 allow system_server system_ndebug_socket:sock_file create_file_perms;