Request specific tags from blkid.

Otherwise blkid can emit tags like SEC_TYPE which mess with the value
extraction code.

Bug: 23069906
Change-Id: Id2a588ff43a538747d1e44cd8218c96ebd0192c2

Utils.cpp

@@ -170,6 +170,12 @@ static status_t readMetadata(const std::string& path, std::string& fsType,
     cmd.push_back(kBlkidPath);
     cmd.push_back("-c");
     cmd.push_back("/dev/null");
+    cmd.push_back("-s");
+    cmd.push_back("TYPE");
+    cmd.push_back("-s");
+    cmd.push_back("UUID");
+    cmd.push_back("-s");
+    cmd.push_back("LABEL");
     cmd.push_back(path);
 
     std::vector<std::string> output;