Update remountUidLegacy to handle "full" mount mode.

Bug: 130791955
Test: manual
Change-Id: I078c2922d1d5a8d16bbb213201a3cad7b1bf4b86
diff --git a/VolumeManager.cpp b/VolumeManager.cpp
index c26eb2c..a6ead9d 100644
--- a/VolumeManager.cpp
+++ b/VolumeManager.cpp
@@ -1103,6 +1103,9 @@
         case VoldNativeService::REMOUNT_MODE_INSTALLER:
             mode = "write";
             break;
+        case VoldNativeService::REMOUNT_MODE_FULL:
+            mode = "full";
+            break;
         default:
             PLOG(ERROR) << "Unknown mode " << std::to_string(mountMode);
             return -1;