MAINTAINERS: New kconfig maintainer

Yann has been the de facto maintainer of kconfig for some time. Update
the KCONFIG entry with his emails address and git tree.
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Michal Marek <mmarek@suse.cz>

MAINTAINERS

@@ -4723,9 +4723,10 @@ F:	Documentation/hwmon/k8temp
 F:	drivers/hwmon/k8temp.c
 
 KCONFIG
-M:	Michal Marek <mmarek@suse.cz>
+M:	"Yann E. MORIN" <yann.morin.1998@free.fr>
 L:	linux-kbuild@vger.kernel.org
-S:	Odd Fixes
+T:	git://gitorious.org/linux-kconfig/linux-kconfig
+S:	Maintained
 F:	Documentation/kbuild/kconfig-language.txt
 F:	scripts/kconfig/