ck_spinlock: Get rid of MCS context initializers.

They are unnecessary, legacy from older versions.

include/ck_spinlock.h

@@ -723,16 +723,6 @@ typedef struct ck_spinlock_mcs * ck_spinlock_mcs_t;
 typedef struct ck_spinlock_mcs ck_spinlock_mcs_context_t;
 
 #define CK_SPINLOCK_MCS_INITIALIZER         (NULL)
-#define CK_SPINLOCK_MCS_CONTEXT_INITIALIZER {false, NULL}
-
-CK_CC_INLINE static void
-ck_spinlock_mcs_context_init(struct ck_spinlock_mcs *queue)
-{
-
-	ck_pr_store_uint(&queue->locked, false);
-	ck_pr_store_ptr(&queue->next, NULL);
-	return;
-}
 
 CK_CC_INLINE static bool
 ck_spinlock_mcs_trylock(struct ck_spinlock_mcs **queue, struct ck_spinlock_mcs *node)