Add <algorithm> to device_files.cpp

(This is a merge of http://go/wvgerrit/101423 to Android.)

This header was missing. On the STL used inside Google, it gets included
transitively, but this is not guaranteed and broke in a partner's STL.

Bug: 154185251
Test: Android Build
Test: CE CDM Build and Unit Tests
Change-Id: If8df7e288073e69250f98d67f732804a955bbaa3

libwvdrmengine/cdm/core/src/device_files.cpp

@@ -6,6 +6,7 @@
 
 #include <string.h>
 
+#include <algorithm>
 #include <string>
 
 #include "certificate_provisioning.h"