MAINTAINERS: mmc: Add path to git tree

This tree has already been added to Stephen Rothwell's list for
linux-next. Make it visible in the MAINTAINERS file as well.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>

MAINTAINERS

@@ -5935,6 +5935,7 @@ M:	Chris Ball <chris@printf.net>
 M:	Ulf Hansson <ulf.hansson@linaro.org>
 L:	linux-mmc@vger.kernel.org
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc.git
+T:	git git://git.linaro.org/people/ulf.hansson/mmc.git
 S:	Maintained
 F:	drivers/mmc/
 F:	include/linux/mmc/