media.metrics changes AString -> std::string

change from AString to std::string for how media.metrics handles
strings.  This severs the dependency on libstagefright_foundation,
where AString is implemented, so we can integrate into places
which do not want to introduce a dependency on libstagefright_foundation.

Bug: 70805723
Test: compilation/linking, CTS subset
Change-Id: I66de971b6ec354444e06112607a2d7614084cef8
diff --git a/services/mediaanalytics/MediaAnalyticsService.h b/services/mediaanalytics/MediaAnalyticsService.h
index fce7d08..1287835 100644
--- a/services/mediaanalytics/MediaAnalyticsService.h
+++ b/services/mediaanalytics/MediaAnalyticsService.h
@@ -136,8 +136,8 @@
     // mapping uids to package names
     struct UidToPkgMap {
         uid_t uid;
-        AString pkg;
-        AString installer;
+        std::string pkg;
+        std::string installer;
         int64_t versionCode;
         nsecs_t expiration;
     };