[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
1 file changed