virtio-blk: Maintain block device spec in separate directory

Move virtio block device specification to its own file similar to
recent virtio devices.
While at it, place device specification, its driver and device
conformance into its own directory to have self contained device
specification.

Fixes: #153

Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

conformance.tex

@@ -135,15 +135,7 @@ \section{Conformance Targets}\label{sec:Conformance / Conformance Targets}
 \end{itemize}
 
 \input{device-types/net/driver-conformance.tex}
-
-\conformance{\subsection}{Block Driver Conformance}\label{sec:Conformance / Driver Conformance / Block Driver Conformance}
-
-A block driver MUST conform to the following normative statements:
-
-\begin{itemize}
-\item \ref{drivernormative:Device Types / Block Device / Device Initialization}
-\item \ref{drivernormative:Device Types / Block Device / Device Operation}
-\end{itemize}
+\input{device-types/blk/driver-conformance.tex}
 
 \conformance{\subsection}{Console Driver Conformance}\label{sec:Conformance / Driver Conformance / Console Driver Conformance}
 
@@ -386,15 +378,7 @@ \section{Conformance Targets}\label{sec:Conformance / Conformance Targets}
 \end{itemize}
 
 \input{device-types/net/device-conformance.tex}
-
-\conformance{\subsection}{Block Device Conformance}\label{sec:Conformance / Device Conformance / Block Device Conformance}
-
-A block device MUST conform to the following normative statements:
-
-\begin{itemize}
-\item \ref{devicenormative:Device Types / Block Device / Device Initialization}
-\item \ref{devicenormative:Device Types / Block Device / Device Operation}
-\end{itemize}
+\input{device-types/blk/device-conformance.tex}
 
 \conformance{\subsection}{Console Device Conformance}\label{sec:Conformance / Device Conformance / Console Device Conformance}