jetson-tx1: remove multilib configuration
jetson-tx1: remove multilib configuration

now that build issues for 64-bit-only builds have been
resolved.

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