Move CPU time in state bpf maps to their own dir,

This will allow us to use a genfscon SELinux rule to get finer grained access control.

Bug: 422976190

Test: Recorded a Perfetto trace with statsd atom  CPU_CYCLES_PER_UID_CLUSTER, tested manually with go/atomtester.
Change-Id: Ic16da605b9d7150d42176c428f0e1ecaf4a9472f

loader/bpfloader.rs

@@ -215,8 +215,8 @@ const GID_MEDIA_RW: u32 = AID_MEDIA_RW;
 const FILE_ARR: &[BpfFileDesc] = &[
     BpfFileDesc {
         filename: "timeInState.bpf",
-        dir: "/etc/bpf/",
-        prefix: "",
+        dir: "/etc/bpf/cputimeinstate/",
+        prefix: "cputimeinstate/",
         critical: false,
         skip_on_user: false,
         maps: &[