Use String8/16 c_str (mainline modules)

Bug: 295394788
Test: make checkbuild
Change-Id: Ia266bccfc9100da25d8605d93c1298a341d2b11a
diff --git a/media/module/foundation/MetaDataBase.cpp b/media/module/foundation/MetaDataBase.cpp
index 3370748..da383fa 100644
--- a/media/module/foundation/MetaDataBase.cpp
+++ b/media/module/foundation/MetaDataBase.cpp
@@ -434,7 +434,7 @@
         char cc[5];
         MakeFourCCString(key, cc);
         const typed_data &item = mInternalData->mItems.valueAt(i);
-        s.appendFormat("%s: %s", cc, item.asString(false).string());
+        s.appendFormat("%s: %s", cc, item.asString(false).c_str());
         if (i != 0) {
             s.append(", ");
         }
@@ -448,7 +448,7 @@
         char cc[5];
         MakeFourCCString(key, cc);
         const typed_data &item = mInternalData->mItems.valueAt(i);
-        ALOGI("%s: %s", cc, item.asString(true /* verbose */).string());
+        ALOGI("%s: %s", cc, item.asString(true /* verbose */).c_str());
     }
 }