doc: update p10 pre-req

Signed-off-by: Paul Bastide <[email protected]>

Author: prb112

README.md

@@ -12,6 +12,8 @@ This project is licensed under the Apache 2.0 License.
 
 This feature uses DynamicResourceAllocation. To setup, go into the Cluster UI, `Administration` -> `CustomResourceDefinitions` -> `FeatureGate` -> `Instances` -> `cluster` add `spec.featureSet: TechPreviewNoUpgrade`
 
+You must have Power10+ nodes to take advantage of the power-dra-driver. It will not allocate nx-gzip access if you are not on a Power10.
+
 ## Install
 
 ```