ARM: tegra: update main repo and add patchwork

Stephen is taking over the main tegra repo, so change the entry to point at his tree on kernel.org

Also, document the patchwork URL.
Signed-off-by: NOlof Johansson <olof@lixom.net>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

MAINTAINERS

@@ -6515,7 +6515,8 @@ M:	Colin Cross <ccross@android.com>
 M:	Olof Johansson <olof@lixom.net>
 M:	Stephen Warren <swarren@wwwdotorg.org>
 L:	linux-tegra@vger.kernel.org
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/olof/tegra.git
+Q:	http://patchwork.ozlabs.org/project/linux-tegra/list/
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-tegra.git
 S:	Supported
 F:	arch/arm/mach-tegra