armv7a: ARMv7-A MMU tools

factor out mmu-related code from armv7a.c, add a 'dump' command for
page tables.

Change-Id: Ic1ac3c645d7fd097e9d625c7c8302e7065875dd4
Signed-off-by: Matthias Welwarsky <matthias.welwarsky@sysgo.com>
Reviewed-on: http://openocd.zylin.com/4327
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>

src/target/cortex_a.c

@@ -50,6 +50,7 @@
 #include "breakpoints.h"
 #include "cortex_a.h"
 #include "register.h"
+#include "armv7a_mmu.h"
 #include "target_request.h"
 #include "target_type.h"
 #include "arm_opcodes.h"
@@ -3121,6 +3122,9 @@ static const struct command_registration cortex_a_exec_command_handlers[] = {
 			"on memory access",
 		.usage = "['on'|'off']",
 	},
+	{
+		.chain = armv7a_mmu_command_handlers,
+	},
 
 	COMMAND_REGISTRATION_DONE
 };