mux: remove the Kconfig question for the subsystem

The MULTIPLEXER question in the Kconfig might be confusing and is
of dubious value. Remove it. This makes consumers responsible for
selecting MULTIPLEXER, which they already do.
Signed-off-by: NPeter Rosin <peda@axentia.se>
Reported-by: NLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/mux/Kconfig

@@ -2,20 +2,11 @@
 # Multiplexer devices
 #
 
-menuconfig MULTIPLEXER
-	tristate "Multiplexer subsystem"
-	help
-	  Multiplexer controller subsystem. Multiplexers are used in a
-	  variety of settings, and this subsystem abstracts their use
-	  so that the rest of the kernel sees a common interface. When
-	  multiple parallel multiplexers are controlled by one single
-	  multiplexer controller, this subsystem also coordinates the
-	  multiplexer accesses.
-
-	  To compile the subsystem as a module, choose M here: the module will
-	  be called mux-core.
+config MULTIPLEXER
+	tristate
 
-if MULTIPLEXER
+menu "Multiplexer drivers"
+	depends on MULTIPLEXER
 
 config MUX_ADG792A
 	tristate "Analog Devices ADG792A/ADG792G Multiplexers"
@@ -56,4 +47,4 @@ config MUX_MMIO
 	  To compile the driver as a module, choose M here: the module will
 	  be called mux-mmio.
 
-endif
+endmenu