serial: Remove unused uart_get_console

uart_get_console() has been unused since 2019's
commit bd0d9d159988 ("serial: remove ks8695 driver")

Remove it, and it's associated docs.

Signed-off-by: "Dr. David Alan Gilbert" <[e-mail]>
Acked-by: Randy Dunlap <[e-mail]>
Reviewed-by: Jiri Slaby <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/driver-api/serial/driver.rst

···
 Console Support
 ---------------
 
-The serial core provides a few helper functions.  This includes identifying
-the correct port structure (via uart_get_console()) and decoding command line
-arguments (uart_parse_options()).
+The serial core provides a few helper functions.  This includes
+decoding command line arguments (uart_parse_options()).
 
 There is also a helper function (uart_console_write()) which performs a
 character by character write, translating newlines to CRLF sequences.
···
            uart_add_one_port uart_remove_one_port uart_console_write
            uart_parse_earlycon uart_parse_options uart_set_options
            uart_get_lsr_info uart_handle_dcd_change uart_handle_cts_change
-           uart_try_toggle_sysrq uart_get_console
+           uart_try_toggle_sysrq
 
 .. kernel-doc:: include/linux/serial_core.h
    :identifiers: uart_port_tx_limited uart_port_tx

drivers/tty/serial/serial_core.c

···
 EXPORT_SYMBOL_GPL(uart_console_write);
 
 /**
- * uart_get_console - get uart port for console
- * @ports: ports to search in
- * @nr: number of @ports
- * @co: console to search for
- * Returns: uart_port for the console @co
- *
- * Check whether an invalid uart number has been specified (as @co->index), and
- * if so, search for the first available port that does have console support.
- */
-struct uart_port * __init
-uart_get_console(struct uart_port *ports, int nr, struct console *co)
-{
-	int idx = co->index;
-
-	if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 &&
-				     ports[idx].membase == NULL))
-		for (idx = 0; idx < nr; idx++)
-			if (ports[idx].iobase != 0 ||
-			    ports[idx].membase != NULL)
-				break;
-
-	co->index = idx;
-
-	return ports + idx;
-}
-
-/**
  * uart_parse_earlycon - Parse earlycon options
  * @p:	     ptr to 2nd field (ie., just beyond '<name>,')
  * @iotype:  ptr for decoded iotype (out)

include/linux/serial_core.h

···
 	return uart_console(port) && console_is_registered(port->cons);
 }
 
-struct uart_port *uart_get_console(struct uart_port *ports, int nr,
-				   struct console *c);
 int uart_parse_earlycon(char *p, enum uart_iotype *iotype,
 			resource_size_t *addr, char **options);
 void uart_parse_options(const char *options, int *baud, int *parity, int *bits,