Atmel: move console default platform_device to serial driver

This variable spread on every SoC that is using the atmel_serial.c
driver can be included directly into the latter.

This will allow to compile multiple soc in the same kernel.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: kernel@avr32linux.org

arch/arm/mach-at91/at91sam9x5.c

@@ -320,7 +320,6 @@ void __init at91sam9x5_initialize(void)
  * -------------------------------------------------------------------- */
 void __init at91_register_uart(unsigned id, unsigned portnr, unsigned pins) {}
 void __init at91_set_serial_console(unsigned portnr) {}
-struct platform_device *atmel_default_console_device = NULL;
 
 void __init at91_add_device_nand(struct atmel_nand_data *data) {}