package: move busybox show others dependency to per-package

package: move busybox show others dependency to per-package

Having the BR2_PACKAGE_BUSYBOX_SHOW_OTHERS dependencies in
package/Config.in is not very practical: it makes this file not very
readable, and puts the dependency away from the package itself, which
can sometimes be confusing. Therefore, this commit moves the dependency
in each package Config.in file.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>