Attach filename to ManifestHal

This allows us to provide more debugging info when an
error is generated from a ManifestHal entry.

Test: libvintf_test
Test: vintf_object_test
Bug: 118757553
Change-Id: I5ae18b5a74da98806314c1a457af0e59170b4db4
diff --git a/ManifestHal.cpp b/ManifestHal.cpp
index 3a2a1c0..f5a1aee 100644
--- a/ManifestHal.cpp
+++ b/ManifestHal.cpp
@@ -36,6 +36,7 @@
 }
 
 bool ManifestHal::operator==(const ManifestHal &other) const {
+    // ignore fileName().
     if (format != other.format)
         return false;
     if (name != other.name)