Consolidate RM service into PD session

This patch integrates three region maps into each PD session to
reduce the session overhead and to simplify the PD creation procedure.
Please refer to the issue cited below for an elaborative discussion.

Note the API change:

With this patch, the semantics of core's RM service have changed. Now,
the service is merely a tool for creating and destroying managed
dataspaces, which are rarely needed. Regular components no longer need a
RM session. For this reason, the corresponding argument for the
'Process' and 'Child' constructors has been removed.

The former interface of the 'Rm_session' is not named 'Region_map'. As a
minor refinement, the 'Fault_type' enum values are now part of the
'Region_map::State' struct.

Issue #1938

repos/base-hw/include/pd_session/connection.h

@@ -1,42 +0,0 @@
-/*
- * \brief  Connection to PD service
- * \author Stefan Kalkowski
- * \author Norman Feske
- * \date   2015-05-20
- *
- * This is a shadow copy of the generic header in base,
- * due to higher memory donation requirements in base-hw
- */
-
-/*
- * Copyright (C) 2015 Genode Labs GmbH
- *
- * This file is part of the Genode OS framework, which is distributed
- * under the terms of the GNU General Public License version 2.
- */
-
-#ifndef _INCLUDE__PD_SESSION__CONNECTION_H_
-#define _INCLUDE__PD_SESSION__CONNECTION_H_
-
-#include <pd_session/client.h>
-#include <base/connection.h>
-
-namespace Genode { struct Pd_connection; }
-
-
-struct Genode::Pd_connection : Connection<Pd_session>, Pd_session_client
-{
-	enum { RAM_QUOTA = 36*1024 };
-
-	/**
-	 * Constructor
-	 *
-	 * \param label  session label
-	 */
-	Pd_connection(char const *label = "")
-	: Connection<Pd_session>(session("ram_quota=%u, label=\"%s\"",
-	                                 RAM_QUOTA, label)),
-	  Pd_session_client(cap()) { }
-};
-
-#endif /* _INCLUDE__PD_SESSION__CONNECTION_H_ */