Add ManifestHal::isOverride().

Hide the isOverride field.

Bug: 73556059
Test: vts_treble_vintf_test
Test: libvintf_test
Change-Id: Ib7d4a96e7043124617841277b06afc456d01672a
Merged-In: Ib7d4a96e7043124617841277b06afc456d01672a
diff --git a/test/LibVintfTest.cpp b/test/LibVintfTest.cpp
index a9f8df6..f0f0423 100644
--- a/test/LibVintfTest.cpp
+++ b/test/LibVintfTest.cpp
@@ -2407,10 +2407,10 @@
     EXPECT_TRUE(gHalManifestConverter(&manifest, xml)) << gHalManifestConverter.lastError();
     const auto& foo = manifest.getHals("android.hardware.foo");
     ASSERT_FALSE(foo.empty());
-    EXPECT_TRUE(foo.front()->isOverride);
+    EXPECT_TRUE(foo.front()->isOverride());
     const auto& bar = manifest.getHals("android.hardware.bar");
     ASSERT_FALSE(bar.empty());
-    EXPECT_FALSE(bar.front()->isOverride);
+    EXPECT_FALSE(bar.front()->isOverride());
 }
 
 // Test functionality of override="true" tag