Reland "Change fallback log to verbose"

This reverts commit 1969020cb4ba15e8cf4c8550128cc83fd91d5475.

Reason for revert: fixed breakage

Test: boot crosshatch
Change-Id: Ibf44c90c2c4467bdc9576e3eaa8e22fd735baa31
diff --git a/JavaGen.cpp b/JavaGen.cpp
index c677163..c2cdaeb 100644
--- a/JavaGen.cpp
+++ b/JavaGen.cpp
@@ -428,7 +428,7 @@
       writer.Write("if (\"\".equals(value)) {\n");
       writer.Indent();
       writer.Write(
-          "Log.d(\"%s\", \"prop %s doesn't exist; fallback to legacy prop "
+          "Log.v(\"%s\", \"prop %s doesn't exist; fallback to legacy prop "
           "%s\");\n",
           class_name.c_str(), prop.prop_name().c_str(),
           prop.legacy_prop_name().c_str());