[ARM] S3C24XX: Fix SERIAL_SAMSUNG entry

The SERIAL_SAMSUNG needs SERIAL_CORE but doesn't select it, leading to a
build failure. Adding a 'select SERIAL_CORE' cure the trouble.

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 5a97544..047c20d 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -451,6 +451,7 @@
 config SERIAL_SAMSUNG
 	tristate "Samsung SoC serial support"
 	depends on ARM && PLAT_S3C24XX
+	select SERIAL_CORE
 	help
 	  Support for the on-chip UARTs on the Samsung S3C24XX series CPUs,
 	  providing /dev/ttySAC0, 1 and 2 (note, some machines may not