hwspinlock: Change hwspinlock to a bool

Change hwspinlock to a bool in case some drivers will meet dependency
issue when hwspinlock is built as a module.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/hwspinlock/Kconfig

@@ -3,7 +3,7 @@
 #
 
 menuconfig HWSPINLOCK
-	tristate "Hardware Spinlock drivers"
+	bool "Hardware Spinlock drivers"
 
 config HWSPINLOCK_OMAP
 	tristate "OMAP Hardware Spinlock device"