dt-bindings: crypto: sa2ul: fix a DT binding check warning

dt-bindings: crypto: sa2ul: fix a DT binding check warning

DT binding check produces a warning about bad cell size:

Documentation/devicetree/bindings/crypto/ti,sa2ul.example.dt.yaml: example-0: crypto@4e00000:reg:0: [0, 81788928, 0, 4608] is too long
	From schema: python3.6/site-packages/dtschema/schemas/reg.yaml

Fix this by reducing the address sizes for the example to 1 cell from
current 2.

Fixes: 2ce9a7299bf6 ("dt-bindings: crypto: Add TI SA2UL crypto accelerator documentation")
Reported-by: Rob Herring <robh@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Link: https://lore.kernel.org/r/20200825133106.21542-2-t-kristo@ti.com
Signed-off-by: Rob Herring <robh@kernel.org>