Add ERF operator to serialization_lib

Signed-off-by: Won Jeon <won.jeon@arm.com>
Change-Id: Idc253e51e7a613cfc0c7da653073a71bf0fcb162
diff --git a/schema/tosa.fbs b/schema/tosa.fbs
index eeed385..057933c 100644
--- a/schema/tosa.fbs
+++ b/schema/tosa.fbs
@@ -116,6 +116,7 @@
   WHILE_LOOP,
   FFT2D,
   RFFT2D,
+  ERF,
 }
 
 union Attribute {