BF16 support in TOSA serialization

Change-Id: I98072019e3dbbf1eab0bc95f74a4546ed82519db
Signed-off-by: James Ward <james.ward@arm.com>
diff --git a/schema/tosa.fbs b/schema/tosa.fbs
index eb76f75..e871562 100644
--- a/schema/tosa.fbs
+++ b/schema/tosa.fbs
@@ -32,6 +32,7 @@
   FP32,
   UINT16,
   FP16,
+  BF16,
 }
 
 enum ResizeMode:uint32 {