ARM: OMAP2+: Use DEFINE_SPINLOCK() for spinlock

spinlock can be initialized automatically with DEFINE_SPINLOCK()
rather than explicitly calling spin_lock_init().
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Lifu Chen <chenlifu@huawei.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/plat-omap/dma.c

@@ -85,7 +85,7 @@ static int dma_lch_count;
 static int dma_chan_count;
 static int omap_dma_reserve_channels;
 
-static spinlock_t dma_chan_lock;
+static DEFINE_SPINLOCK(dma_chan_lock);
 static struct omap_dma_lch *dma_chan;
 
 static inline void disable_lnk(int lch);
@@ -902,7 +902,6 @@ static int omap_system_dma_probe(struct platform_device *pdev)
 	if (!dma_chan)
 		return -ENOMEM;
 
-	spin_lock_init(&dma_chan_lock);
 	for (ch = 0; ch < dma_chan_count; ch++) {
 		omap_clear_dma(ch);