hwspinlock: depend on OMAP4

Currently only OMAP4 supports hwspinlocks, so don't bother asking
anyone else.
Signed-off-by: NOhad Ben-Cohen <ohad@wizery.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

drivers/hwspinlock/Kconfig

@@ -4,6 +4,7 @@
 
 config HWSPINLOCK
 	tristate "Generic Hardware Spinlock framework"
+	depends on ARCH_OMAP4
 	help
 	  Say y here to support the generic hardware spinlock framework.
 	  You only need to enable this if you have hardware spinlock module