SAMSUNG: serial: modify name from s5pc1xx to s5p

Because of other s5p series SoC will use these serial functions,
modify function's name and structure's name.

Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/include/serial.h b/include/serial.h
index 6423fba..111edbe 100644
--- a/include/serial.h
+++ b/include/serial.h
@@ -52,10 +52,10 @@
 #endif
 
 #if defined(CONFIG_S5PC1XX)
-extern struct serial_device s5pc1xx_serial0_device;
-extern struct serial_device s5pc1xx_serial1_device;
-extern struct serial_device s5pc1xx_serial2_device;
-extern struct serial_device s5pc1xx_serial3_device;
+extern struct serial_device s5p_serial0_device;
+extern struct serial_device s5p_serial1_device;
+extern struct serial_device s5p_serial2_device;
+extern struct serial_device s5p_serial3_device;
 #endif
 
 #if defined(CONFIG_OMAP3_ZOOM2)