serial: fix vr41xx_siu serial console support

The serial console can select only SERIAL_VR41XX=y.

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 819fc3e..64ff6a5 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -1191,7 +1191,7 @@
 
 config SERIAL_VR41XX_CONSOLE
 	bool "Enable NEC VR4100 series Serial Interface Unit console"
-	depends on SERIAL_VR41XX
+	depends on SERIAL_VR41XX=y
 	select SERIAL_CORE_CONSOLE
 	help
 	  If you have a NEC VR4100 series processor and you want to use