move ACTION_SERVICE_STATE to system api

As per CDD: The "android.*" namespace for intent constants is reserved
for public
Android API in AOSP. (Whether public to the full SDK, @SystemApi or
defined in AOSP support libraries.)
ACTION_SERVICE_STATE intent is generally useful for system/oem
apps thus move to system api

Bug: 33679956
Test: Manual
Change-Id: Ie38b53f077e8a013351d35387f9133e0ebb26cc9