sh: Remove superhyway bus support

The superhyway bus driver was only referenced on SH4-202, which is now gone,
so remove it all as well.

I could find no trace of anything ever calling superhyway_register_driver(),
not in the git history but also not on the web, so I assume this has never
served any purpose on mainline kernels.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Link: https://lore.kernel.org/r/20230914155523.3839811-3-arnd@kernel.org
Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>

Author: arndb

Documentation/arch/sh/index.rst

@@ -43,12 +43,6 @@ mach-x3proto
 Busses
 ======
 
-SuperHyway
-----------
-
-.. kernel-doc:: drivers/sh/superhyway/superhyway.c
-   :export:
-
 Maple
 -----
 

arch/sh/Kconfig

@@ -737,10 +737,6 @@ endmenu
 
 menu "Bus options"
 
-config SUPERHYWAY
-	tristate "SuperHyway Bus support"
-	depends on CPU_SUBTYPE_SH4_202
-
 config MAPLE
 	bool "Maple Bus support"
 	depends on SH_DREAMCAST

arch/sh/drivers/Makefile

@@ -6,6 +6,5 @@
 obj-y		+= dma/ platform_early.o
 
 obj-$(CONFIG_PCI)		+= pci/
-obj-$(CONFIG_SUPERHYWAY)	+= superhyway/
 obj-$(CONFIG_PUSH_SWITCH)	+= push-switch.o
 obj-$(CONFIG_HEARTBEAT)		+= heartbeat.o

arch/sh/drivers/superhyway/Makefile

@@ -7,6 +7,5 @@ ifneq ($(CONFIG_COMMON_CLK),y)
 obj-$(CONFIG_HAVE_CLK)			+= clk/
 endif
 obj-$(CONFIG_MAPLE)			+= maple/
-obj-$(CONFIG_SUPERHYWAY)		+= superhyway/
 
 obj-y					+= pm_runtime.o