[ref model] Add acc_type to Conv Ops

This patch implements changes required by the new acc_type field in
ConvAttribute and TransposeConvAttribute

Signed-off-by: Tai Ly <tai.ly@arm.com>
Signed-off-by: Jeremy Johnson <jeremy.johnson@arm.com>
Change-Id: Ib13dbeec4d8920e0ddbcca02b727e7277f2c8d62
diff --git a/.gitignore b/.gitignore
index 941cf20..dddbcc0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,9 @@
 __pycache__/
 build/
 debug-build/
+conformance/
+conformance_build/
+conformance_large_files/
 .cache
 compile_commands.json
 dist/