Use String8/16 c_str [media]

Bug: 295394788
Test: make checkbuild
Change-Id: I4ba5400f39c769bec59508525844f1daefe1d15c
diff --git a/drm/libmediadrm/DrmMetricsLogger.cpp b/drm/libmediadrm/DrmMetricsLogger.cpp
index ce4d730..7d600cb 100644
--- a/drm/libmediadrm/DrmMetricsLogger.cpp
+++ b/drm/libmediadrm/DrmMetricsLogger.cpp
@@ -151,7 +151,7 @@
     if (status == OK) {
         String8 version8;
         if (getPropertyString(String8("version"), version8) == OK) {
-            mVersion = version8.string();
+            mVersion = version8.c_str();
         }
         reportMediaDrmCreated();
     } else {