arm: Don't use create_proc_read_entry()

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Russell King <linux@arm.linux.org.uk>
cc: Kevin Hilman <khilman@deeprootsystems.com>
cc: Tony Lindgren <tony@atomide.com>
cc: linux-arm-kernel@lists.infradead.org
cc: linux-omap@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>