[incremental] remove legacy service name from sepolicy

(Cherry-picking)

We now only have one system service, called "incremental".

Test: builds
BUG: 150406132
Merged-In: I47643bac5711dcd4291bf4bf1cdcb853a0f51fb4
Change-Id: I6f96d3953611f34cdb52b958dfa95120ae930e35
diff --git a/private/service_contexts b/private/service_contexts
index db2a62a..5e9b212 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -107,7 +107,6 @@
 ims                                       u:object_r:radio_service:s0
 imms                                      u:object_r:imms_service:s0
 incremental                               u:object_r:incremental_service:s0
-incremental_service                       u:object_r:incremental_service:s0
 ipsec                                     u:object_r:ipsec_service:s0
 ircsmessage                               u:object_r:radio_service:s0
 iris                                      u:object_r:iris_service:s0