[CPUFREQ] Update MAINTAINERS to reflect new mailing list.

Mailing list moved to vger.
Signed-off-by: Dave Jones <davej@redhat.com>

MAINTAINERS

@@ -1244,7 +1244,7 @@ S:	Maintained
 CPU FREQUENCY DRIVERS
 P:	Dave Jones
 M:	davej@codemonkey.org.uk
-L:	cpufreq@lists.linux.org.uk
+L:	cpufreq@vger.kernel.org
 W:	http://www.codemonkey.org.uk/projects/cpufreq/
 T:	git kernel.org/pub/scm/linux/kernel/git/davej/cpufreq.git
 S:	Maintained