ARM: tegra: Enable GMI driver in default configuration

Enable the new Tegra GMI driver for the default configuration.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/configs/tegra_defconfig

@@ -79,6 +79,7 @@ CONFIG_DEVTMPFS_MOUNT=y
 # CONFIG_FIRMWARE_IN_KERNEL is not set
 CONFIG_DMA_CMA=y
 CONFIG_CMA_SIZE_MBYTES=64
+CONFIG_TEGRA_GMI=y
 CONFIG_MTD=y
 CONFIG_MTD_M25P80=y
 CONFIG_MTD_SPI_NOR=y