dt-bindings: Add missing 'properties' keyword enclosing 'snps,tso'

dt-bindings: Add missing 'properties' keyword enclosing 'snps,tso'

DT property definitions must be under a 'properties' keyword. This was
missing for 'snps,tso' in an if/then clause. A meta-schema fix will
catch future errors like this.

Fixes: 3e17e298c4e9 ("dt-bindings: net: stmmac: Convert the binding to a schemas")
Cc: "David S. Miller" <davem@davemloft.net>
Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>