[U-Boot] Warnings from Tegra LCD conversion?

[Stephen Warren]

While checking on the travis-ci.org runs that include test/py testing of
sandbox, I noticed some new warnings on AArch64 Tegra boards. See the
log at:

https://travis-ci.org/u-boot/u-boot/jobs/109471848

> Building current source for 33 boards (2 threads, 1 job per thread)
>    aarch64:  +   e2220-1170
> +warning: (TEGRA_COMMON) selects VIDCONSOLE_AS_LCD which has unmet direct dependencies (DM_VIDEO)
>    aarch64:  +   p2571
> +warning: (TEGRA_COMMON) selects VIDCONSOLE_AS_LCD which has unmet direct dependencies (DM_VIDEO)
>    aarch64:  +   p2371-0000
> +warning: (TEGRA_COMMON) selects VIDCONSOLE_AS_LCD which has unmet direct dependencies (DM_VIDEO)
>    aarch64:  +   p2371-2180
> +warning: (TEGRA_COMMON) selects VIDCONSOLE_AS_LCD which has unmet direct dependencies (DM_VIDEO)