dt-bindings: arm: qcom-ipq4019: add missing device compatible

One board version (dk01.1-c1) didn't have set device compatible,
so let's list it.

Signed-off-by: David Heidelberg <david@ixit.cz>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211009193102.76852-1-david@ixit.cz