soundwire: fix regmap dependencies and align with other serial links

The existing code has a mixed select/depend usage which makes no sense.

config SOUNDWIRE_BUS
       tristate
       select REGMAP_SOUNDWIRE

config REGMAP_SOUNDWIRE
        tristate
        depends on SOUNDWIRE_BUS

Let's remove one layer of Kconfig definitions and align with the
solutions used by all other serial links.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190718230215.18675-1-pierre-louis.bossart@linux.intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/base/regmap/Kconfig

@@ -44,7 +44,7 @@ config REGMAP_IRQ
 
 config REGMAP_SOUNDWIRE
 	tristate
-	depends on SOUNDWIRE_BUS
+	depends on SOUNDWIRE
 
 config REGMAP_SCCB
 	tristate

drivers/soundwire/Kconfig

@@ -4,7 +4,7 @@
 #
 
 menuconfig SOUNDWIRE
-	bool "SoundWire support"
+	tristate "SoundWire support"
 	help
 	  SoundWire is a 2-Pin interface with data and clock line ratified
 	  by the MIPI Alliance. SoundWire is used for transporting data
@@ -17,17 +17,12 @@ if SOUNDWIRE
 
 comment "SoundWire Devices"
 
-config SOUNDWIRE_BUS
-	tristate
-	select REGMAP_SOUNDWIRE
-
 config SOUNDWIRE_CADENCE
 	tristate
 
 config SOUNDWIRE_INTEL
 	tristate "Intel SoundWire Master driver"
 	select SOUNDWIRE_CADENCE
-	select SOUNDWIRE_BUS
 	depends on X86 && ACPI && SND_SOC
 	help
 	  SoundWire Intel Master driver.

drivers/soundwire/Makefile

@@ -5,7 +5,7 @@
 
 #Bus Objs
 soundwire-bus-objs := bus_type.o bus.o slave.o mipi_disco.o stream.o
-obj-$(CONFIG_SOUNDWIRE_BUS) += soundwire-bus.o
+obj-$(CONFIG_SOUNDWIRE) += soundwire-bus.o
 
 #Cadence Objs
 soundwire-cadence-objs := cadence_master.o