dt-bindings: arm: stm32: Document IoT Box compatible

Document devicetree compatible of Shiratech IoT Box.

Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>
1 file changed