[USB] Change default volume label for ExFat format mounts while
formatting.

Test: manual by flashing and formatting drive.

Ignore-AOSP-First: Needs to be tested and dogfooded internally first before sending to AOSP.

Bug: 256073477

Change-Id: I2a904a81130ec40602ac7e44e1b1435cd1d54d8f
diff --git a/fs/Exfat.cpp b/fs/Exfat.cpp
index 48fa6a3..6444178 100644
--- a/fs/Exfat.cpp
+++ b/fs/Exfat.cpp
@@ -102,7 +102,7 @@
     std::vector<std::string> cmd;
     cmd.push_back(kMkfsPath);
     cmd.push_back("-n");
-    cmd.push_back("android");
+    cmd.push_back("External");
     cmd.push_back(source);
 
     int rc = ForkExecvp(cmd);