MAINTAINERS: Add git tree link for PPC KVM

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>

MAINTAINERS

@@ -4253,6 +4253,7 @@ KERNEL VIRTUAL MACHINE (KVM) FOR POWERPC
 M:	Alexander Graf <agraf@suse.de>
 L:	kvm-ppc@vger.kernel.org
 W:	http://kvm.qumranet.com
+T:	git git://github.com/agraf/linux-2.6.git
 S:	Supported
 F:	arch/powerpc/include/asm/kvm*
 F:	arch/powerpc/kvm/