serial: pl011: Mark console as CON_ANYTIME

Exactly as in a80c49db ("serial8250: Mark console as CON_ANYTIME"),
to enable printk() during CPU hot-plugging.

Actually most of the serial console drivers do not use per-cpu resources
and can be marked as CON_ANYTIME.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: linux-serial@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>