Use Log.e for procfs file read errors

Log.wtf implies a catastrophic, unrecoverable failure. Failures to read
procfs files (e.g., due to permissions or non-existence) are better
represented by Log.e as they are often recoverable or expected under
certain conditions, and not always indicative of a fatal application state.

Flag: EXEMPT mainline
Bug: 429012888
Test: TH
Change-Id: I717d46d4c3802ac478e80d2a9dd28c79a9ebc5f7

staticlibs/device/com/android/net/module/util/ProcfsParsingUtils.java

@@ -78,7 +78,7 @@ public final class ProcfsParsingUtils {
                 lines.add(line);
             }
         } catch (IOException e) {
-            Log.wtf(TAG, "failed to read " + filePath, e);
+            Log.e(TAG, "failed to read " + filePath, e);
         }
 
         return lines;