subsystem: console: tty init checks and support for polled-only devices

This patch add tty runtime initialization check for console support
routines. Without it callers of routines API are not aware that
initialization of tty was failed. This patch basically checks
availability of console device and also its support for
interrupt driven transfers if routines are configured to use it.

Signed-off-by: Pavel Kral <pavel.kral@omsquare.com>