dt-bindings: crypto: Add new compatible qcom, prng-ee

Later qcom chips support v2 of the prng, which exposes an EE
(Execution Environment) for OS to use so add new compatible
qcom,prng-ee for this.
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Documentation/devicetree/bindings/crypto/qcom,prng.txt

@@ -2,7 +2,9 @@ Qualcomm MSM pseudo random number generator.
 
 Required properties:
 
-- compatible  : should be "qcom,prng"
+- compatible  : should be "qcom,prng" for 8916 etc
+              : should be "qcom,prng-ee" for 8996 and later using EE
+		(Execution Environment) slice of prng
 - reg         : specifies base physical address and size of the registers map
 - clocks      : phandle to clock-controller plus clock-specifier pair
 - clock-names : "core" clocks all registers, FIFO and circuits in PRNG IP block