board: asus: tf600t: enable TEGRA20_SLINK only for TF600T

Of all T30 transformers, only the TF600T uses SPI flash and
needs SLINK driver to work with it. Move this configuration
to the tf600t fragment from common defconfig.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
2 files changed