ARM: remove duplicate include from arch/arm/mach-dove/common.c

Jesper Juhl pointed out there is a redundant include of
linux/serial_8250.h. However it turns out both are redundant.
This patch removes them both.
Reported-by: NJesper Juhl <jj@chaosbits.net>
Signed-off-by: NAndrew Lunn <andrew@lunn.ch>
Reviewed-by: NJesper Juhl <jj@chaosbits.net>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

arch/arm/mach-dove/common.c

@@ -13,11 +13,9 @@
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/pci.h>
-#include <linux/serial_8250.h>
 #include <linux/clk.h>
 #include <linux/mbus.h>
 #include <linux/ata_platform.h>
-#include <linux/serial_8250.h>
 #include <linux/gpio.h>
 #include <asm/page.h>
 #include <asm/setup.h>