console: tty: Remove dependency on older "consoles"

Console subsystem doesn't depend on older consoles-in-drivers, the
only common thing between them is CONFIG_UART_CONSOLE_ON_DEV_NAME
setting, so make it so (by depending on either UART_CONSOLE or
CONSOLE_SUBSYS.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>