MAINTAINERS: add defconfig file to TEGRA section

Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NStephen Warren <swarren@nvidia.com>

MAINTAINERS

@@ -6784,6 +6784,7 @@ 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
+F:	arch/arm/configs/tegra_defconfig
 
 TEHUTI ETHERNET DRIVER
 M:	Andy Gospodarek <andy@greyhouse.net>