arm: remove machine_desc.io_pg_offst and .phys_io

Since we're now using addruart to establish the debug mapping, we can
remove the io_pg_offst and phys_io members of struct machine_desc.

The various declarations were removed using the following script:

  grep -rl MACHINE_START arch/arm | xargs \
  sed -i '/MACHINE_START/,/MACHINE_END/ { /\.\(phys_io\|io_pg_offst\)/d }'

[ Initial patch was from Jeremy Kerr, example script from Russell King ]

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: Eric Miao <eric.miao at canonical.com>

arch/arm/include/asm/mach/arch.h

@@ -16,14 +16,10 @@ struct sys_timer;
 
 struct machine_desc {
 	/*
-	 * Note! The first four elements are used
+	 * Note! The first two elements are used
 	 * by assembler code in head.S, head-common.S
 	 */
 	unsigned int		nr;		/* architecture number	*/
-	unsigned int		phys_io;	/* start of physical io	*/
-	unsigned int		io_pg_offst;	/* byte offset for io 
-						 * page tabe entry	*/
-
 	const char		*name;		/* architecture name	*/
 	unsigned long		boot_params;	/* tagged list		*/