[S390] Remove unused GENERIC_BUST_SPINLOCK from Kconfig.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/Kconfig

@@ -33,9 +33,6 @@ config GENERIC_CALIBRATE_DELAY
 config GENERIC_TIME
 	def_bool y
 
-config GENERIC_BUST_SPINLOCK
-	bool
-
 mainmenu "Linux Kernel Configuration"
 
 config S390