MAINTAINERS: Add git repository and update my address

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

MAINTAINERS

@@ -7431,9 +7431,10 @@ S:	Maintained
 F:	drivers/clk/spear/
 
 SPI SUBSYSTEM
-M:	Mark Brown <broonie@opensource.wolfsonmicro.com>
+M:	Mark Brown <broonie@kernel.org>
 M:	Grant Likely <grant.likely@linaro.org>
 L:	spi-devel-general@lists.sourceforge.net
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git
 Q:	http://patchwork.kernel.org/project/spi-devel-general/list/
 S:	Maintained
 F:	Documentation/spi/