jetson-tx1: override PACKAGE_ARCH for packagegroup-x11-base as well
jetson-tx1: override PACKAGE_ARCH for packagegroup-x11-base as well

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