ARM: OMAP: Split plat/serial.h for omap1 and omap2+

For omap1, we'll keep mach/serial.h around for 8250.c hardware
workarounds. For omap2+, we no longer need mach/serial.h and
can make it local to mach-omap2.

Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
index d135d55..c85022a 100644
--- a/arch/arm/mach-omap2/common.h
+++ b/arch/arm/mach-omap2/common.h
@@ -34,11 +34,10 @@
 
 #include <asm/proc-fns.h>
 
-#include <plat/serial.h>
-
 #include "../plat-omap/common.h"
 
 #include "i2c.h"
+#include "serial.h"
 
 #define OMAP_INTC_START		NR_IRQS