buildroot

i2c-tools: depend on BUSYBOX_SHOW_OTHERS

As of version 1.25.0 busybox by default includes a nearly complete
implementation of i2c-tools. Hide the upstream version unless the
BR2_PACKAGE_BUSYBOX_SHOW_OTHERS option is selected.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>