detect: Handle "Not Readable" elements in IPMI SDR
detect: Handle "Not Readable" elements in IPMI SDR

When a component is reported as "Not Readable" in the IPMI SDR, don't
try to consider units here, just report "Not Readable"

lebauce/edeploy,lebauce/edeploy,enovance/edeploy,enovance/edeploy,redhat-cip/edeploy,redhat-cip/edeploy,enovance/edeploy,lebauce/edeploy,redhat-cip/edeploy,enovance/edeploy,redhat-cip/edeploy,lebauce/edeploy