[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: NRobert P. J. Day <rpjday@mindspring.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/Kconfig

@@ -114,9 +114,6 @@ config GENERIC_CALIBRATE_DELAY
 	bool
 	default y
 
-config GENERIC_BUST_SPINLOCK
-	bool
-
 config ARCH_MAY_HAVE_PC_FDC
 	bool