MIPS: Alchemy: Use DEFINE_SPINLOCK() for spinlock

spinlock can be initialized automatically with DEFINE_SPINLOCK()
rather than explicitly calling spin_lock_init().

Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Lifu Chen <[e-mail]>
Signed-off-by: Thomas Bogendoerfer <[e-mail]>

arch/mips/alchemy/common/clock.c

···
 /* access locks to SYS_FREQCTRL0/1 and SYS_CLKSRC registers */
 static spinlock_t alchemy_clk_fg0_lock;
 static spinlock_t alchemy_clk_fg1_lock;
-static spinlock_t alchemy_clk_csrc_lock;
+static DEFINE_SPINLOCK(alchemy_clk_csrc_lock);
 
 /* CPU Core clock *****************************************************/
 
···
 	if (!a)
 		return -ENOMEM;
 
-	spin_lock_init(&alchemy_clk_csrc_lock);
 	ret = 0;
 
 	for (i = 0; i < 6; i++) {