serial: timberdale: Remove dependancies

MFD_TIMBERDALE doesn't appear to be defined anywhere. However the code in
question can build happily without platform specifics so remove the check
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/serial/Kconfig

@@ -1449,7 +1449,6 @@ config SERIAL_BFIN_SPORT3_UART
 
 config SERIAL_TIMBERDALE
 	tristate "Support for timberdale UART"
-	depends on MFD_TIMBERDALE
 	select SERIAL_CORE
 	---help---
 	Add support for UART controller on timberdale.