ARM: spear: remove obsolete config MACH_SPEAR600

ARM: spear: remove obsolete config MACH_SPEAR600

Since commit ddb902cc ("ARM: centralize common multi-platform kconfig
options"), the config MACH_SPEAR600 has no effect. Remove this config.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20230320130159.32316-1-lukas.bulwahn@gmail.comSigned-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/mach-spear/Kconfig

@@ -81,12 +81,6 @@ config ARCH_SPEAR6XX
 	help
 	  Supports for ARM's SPEAR6XX family
 
-config MACH_SPEAR600
-	def_bool y
-	depends on ARCH_SPEAR6XX
-	help
-	  Supports ST SPEAr600 boards configured via the device-tree
-
 config ARCH_SPEAR_AUTO
 	bool
 	depends on !ARCH_SPEAR13XX && !ARCH_SPEAR6XX