MAINTAINERS: add defconfig file to TEGRA section

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index fdc0119..ae54678 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6784,6 +6784,7 @@
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-tegra.git
 S:	Supported
 F:	arch/arm/mach-tegra
+F:	arch/arm/configs/tegra_defconfig
 
 TEHUTI ETHERNET DRIVER
 M:	Andy Gospodarek <andy@greyhouse.net>