scripts/kallsyms: filter symbols not in kernel address space

This patch uses CONFIG_PAGE_OFFSET to filter symbols which
are not in kernel address space because these symbols are
generally for generating code purpose and can't be run at
kernel mode, so we needn't keep them in /proc/kallsyms.

For example, on ARM there are some symbols which may be
linked in relocatable code section, then perf can't parse
symbols any more from /proc/kallsyms, this patch fixes the
problem (introduced b9b32bf70f2fb710b07c94e13afbc729afe221da)

Cc: Russell King <linux@arm.linux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Michal Marek <mmarek@suse.cz>
Cc: stable@vger.kernel.org
[nleeder@codeaurora.org: move flag to Makefile because original file
 scripts/link-vmlinux.sh does not exist in 3.4]

Change-Id: I2f830cbfa4d6411bfbe7592dad97bd93ba8cc359
Signed-off-by: Neil Leeder <nleeder@codeaurora.org>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>