Add missing test file.

Change-Id: I4a4a4ae6dbf5273e116fb43f3e6e7d3625c21f35
diff --git a/tests/avifinfo_test_12x34_gainmap_tmap.avif b/tests/avifinfo_test_12x34_gainmap_tmap.avif
new file mode 100644
index 0000000..3d26c72
--- /dev/null
+++ b/tests/avifinfo_test_12x34_gainmap_tmap.avif
Binary files differ