storaged: move proto file to /data/misc_ce/0/storaged

Use proto_stat to indicate status of CE area. Before user_0 unlocks,
storaged detects CE NOT_AVAILABLE when attempting to read the proto
file. It then skips reading/writting the proto.

When user_0 logs in, vold calls onUserStart in storaged, which sets
proto_stat to AVAILABLE. At next event, storaged tries to read the
proto. If it's a success, proto_stat is changed to LOADED. After that,
storaged reads and writes proto normally.

Test: adb shell storaged -u -p
Bug: 63740245
Change-Id: I1fdd42c430e91682f6cc07497fcad5be52489b4e
diff --git a/storaged/storaged_info.cpp b/storaged/storaged_info.cpp
index 4243bd7..ae26f20 100644
--- a/storaged/storaged_info.cpp
+++ b/storaged/storaged_info.cpp
@@ -66,7 +66,7 @@
     return new storage_info_t;
 }
 
-void storage_info_t::init(const IOPerfHistory& perf_history)
+void storage_info_t::load_perf_history_proto(const IOPerfHistory& perf_history)
 {
     if (!perf_history.has_day_start_sec() ||
         perf_history.daily_perf_size() > (int)daily_perf.size() ||