linux-tegra-4.9: fix KERNEL_REPO setting
linux-tegra-4.9: fix KERNEL_REPO setting

to point to the Github-hosted repository.

Signed-off-by: Matt Madison <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@madison.systems>

madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra