Add Fenghua Yu as temporary co-maintainer for ia64

I'm taking my sabbatical from Intel for July/August 2009.
Fenghua Yu will handle ia64 architecture while I'm gone.
Signed-off-by: Tony Luck <tony.luck@intel.com>

MAINTAINERS

@@ -2851,7 +2851,9 @@ S:	Maintained
 
 IA64 (Itanium) PLATFORM
 P:	Tony Luck
+P:	Fenghua Yu
 M:	tony.luck@intel.com
+M:	fenghua.yu@intel.com
 L:	linux-ia64@vger.kernel.org
 W:	http://www.ia64-linux.org/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6.git