[ARM] remove useless config option GENERIC_BUST_SPINLOCK

Remove the apparently useless config option GENERIC_BUST_SPINLOCK,
since nothing in the source tree refers to it.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 34d1462..52c209e 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -114,9 +114,6 @@
 	bool
 	default y
 
-config GENERIC_BUST_SPINLOCK
-	bool
-
 config ARCH_MAY_HAVE_PC_FDC
 	bool