Combine the Tegra USB header file into one header file for all SoCs.
Use ifdef to account for the difference, especially Tegra20 is quite
different from newer SoCs. This avoids duplication, mainly for
Tegra30 and newer devices.
Reviewed-by: Stephen Warren <email@example.com>
Signed-off-by: Stefan Agner <firstname.lastname@example.org>
Signed-off-by: Tom Warren <email@example.com>