ARM: SAMSUNG: Replace inclusion of plat/regs-serial.h header file

regs-serial.h only includes linux/serial_s3c.h. Include this header
directly to remove unnecessary platform dependency.

Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
[broonie@linaro.org: Acked for S3C64XX related changes]
Acked-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/mach-s3c64xx/irq-pm.c b/arch/arm/mach-s3c64xx/irq-pm.c
index 1649c0d..a61247b 100644
--- a/arch/arm/mach-s3c64xx/irq-pm.c
+++ b/arch/arm/mach-s3c64xx/irq-pm.c
@@ -20,13 +20,13 @@
 #include <linux/syscore_ops.h>
 #include <linux/interrupt.h>
 #include <linux/serial_core.h>
+#include <linux/serial_s3c.h>
 #include <linux/irq.h>
 #include <linux/io.h>
 #include <linux/of.h>
 
 #include <mach/map.h>
 
-#include <plat/regs-serial.h>
 #include <mach/regs-gpio.h>
 #include <plat/cpu.h>
 #include <plat/pm.h>