console/uart8250*: Remove inclusion of mc146818rtc.h

The RTC functionality provided by the include is specific to x86, but
is not used in these files.

Change-Id: I82d0dfdb6e8b67bc81291a7a5d63ced91e095772
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/4586
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/console/uart8250_console.c

@@ -19,7 +19,6 @@
 
 #include <console/console.h>
 #include <uart8250.h>
-#include <pc80/mc146818rtc.h>
 
 static void ttyS0_init(void)
 {

src/console/uart8250mem_console.c

@@ -19,7 +19,6 @@
 
 #include <console/console.h>
 #include <uart8250.h>
-#include <pc80/mc146818rtc.h>
 
 static u32 uart_bar = 0;