dt-bindings: crypto: Move prng binding to crypto

Now that we are adding new driver for prng in crypto, move the
binding as well.

Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/Documentation/devicetree/bindings/rng/qcom,prng.txt b/Documentation/devicetree/bindings/crypto/qcom,prng.txt
similarity index 100%
rename from Documentation/devicetree/bindings/rng/qcom,prng.txt
rename to Documentation/devicetree/bindings/crypto/qcom,prng.txt