fix SERIAL_CORE_CONSOLE driver dependencies

SERIAL_BFIN=m or SERIAL_MUX=m shouldn't allow SERIAL_CORE_CONSOLE=y.

Additionally, this patch fixes whitespace instead of tabs at the
SERIAL_MUX_CONSOLE option.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Cc: Bryan Wu <bryan.wu@analog.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/serial/Kconfig

@@ -611,7 +611,7 @@ config SERIAL_BFIN
 
 config SERIAL_BFIN_CONSOLE
 	bool "Console on Blackfin serial port"
-	depends on SERIAL_BFIN
+	depends on SERIAL_BFIN=y
 	select SERIAL_CORE_CONSOLE
 
 choice
@@ -833,7 +833,7 @@ config SERIAL_MUX
 
 config SERIAL_MUX_CONSOLE
 	bool "Support for console on serial MUX"
-        depends on SERIAL_MUX
+	depends on SERIAL_MUX=y
 	select SERIAL_CORE_CONSOLE
 	default y