console: kconfig: Do not assign promptless CONSOLE_HAS_DRIVER

Assignments have no effect on promptless symbols. Flagged by
https://github.com/zephyrproject-rtos/zephyr/pull/20742

.

These configuration files all enable UART_CONSOLE, which selects
CONSOLE_HAS_DRIVER.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>