init.rc: Disable native stats collection service

When opening and closing activities in Settings, a measurably
significant amount of CPU time is spent processing and logging stats
events in statsd:

0.02%     /apex/com.android.os.statsd/lib64/libstatspull.so                                                                                         @plt
0.01%     /apex/com.android.os.statsd/bin/statsd                                                                                                    @plt
0.01%     /apex/com.android.os.statsd/bin/statsd                                                                                                    SocketListener::runListener()
0.01%     /apex/com.android.os.statsd/bin/statsd                                                                                                    android::os::statsd::LogEvent::parseBuffer(unsigned char*, unsigned long)
0.01%     /apex/com.android.os.statsd/bin/statsd                                                                                                    android::os::statsd::LogEvent::parseAnnotations(unsigned char, int)

Over longer device uptimes with real-world usage, statsd uses a
substantial amount of total CPU time. We have no use for the stats
recorded by statsd, so disable the service entirely to save CPU in
potential hotpaths.

This is the system/core part of the change; changes to frameworks/base
are also required.

Test: simpleperf record -a; verify that statsd no longer appears in
      sample hits
Change-Id: Idf6fdb0eff987169bd5f370dd72315e831a669e6
Tested-By: SakuraiLH-MergeBot <quantalogic@outlook.com>

rootdir/init.rc

@@ -812,23 +812,20 @@ on zygote-start && property:persist.sys.fuse=""
 on zygote-start && property:ro.crypto.state=unencrypted
     # A/B update verifier that marks a successful boot.
     exec_start update_verifier_nonencrypted
-    start statsd
     start netd
     start zygote
     start zygote_secondary
 
 on zygote-start && property:ro.crypto.state=unsupported
     # A/B update verifier that marks a successful boot.
     exec_start update_verifier_nonencrypted
-    start statsd
     start netd
     start zygote
     start zygote_secondary
 
 on zygote-start && property:ro.crypto.state=encrypted && property:ro.crypto.type=file
     # A/B update verifier that marks a successful boot.
     exec_start update_verifier_nonencrypted
-    start statsd
     start netd
     start zygote
     start zygote_secondary