mfd: rz-mtu3: Replace raw_spin_lock->spin_lock()

As per kernel documentation, use raw_spinlock_t only in real critical core
code, low-level interrupt handling, and places where disabling preemption
or interrupts is required. Here the lock is for concurrent register access
from different drivers, hence spin_lock() is sufficient.

Reported-by: Pavel Machek <[e-mail]>
Closes: https://lore.kernel.org/all/[e-mail]/
Signed-off-by: Biju Das <[e-mail]>
Reviewed-by: Pavel Machek <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/rz-mtu3.c

···
 struct rz_mtu3_priv {
 	void __iomem *mmio;
 	struct reset_control *rstc;
-	raw_spinlock_t lock;
+	spinlock_t lock;
 };
 
 /******* MTU3 registers (original offset is +0x1200) *******/
···
 	struct rz_mtu3_priv *priv = mtu->priv_data;
 	unsigned long tmdr, flags;
 
-	raw_spin_lock_irqsave(&priv->lock, flags);
+	spin_lock_irqsave(&priv->lock, flags);
 	tmdr = rz_mtu3_shared_reg_read(ch, offset);
 	__assign_bit(pos, &tmdr, !!val);
 	rz_mtu3_shared_reg_write(ch, offset, tmdr);
-	raw_spin_unlock_irqrestore(&priv->lock, flags);
+	spin_unlock_irqrestore(&priv->lock, flags);
 }
 EXPORT_SYMBOL_GPL(rz_mtu3_shared_reg_update_bit);
 
···
 	bitpos = rz_mtu3_get_tstr_bit_pos(ch);
 
 	/* start stop register shared by multiple timer channels */
-	raw_spin_lock_irqsave(&priv->lock, flags);
+	spin_lock_irqsave(&priv->lock, flags);
 
 	tstr = rz_mtu3_shared_reg_read(ch, offset);
 	__assign_bit(bitpos, &tstr, start);
 	rz_mtu3_shared_reg_write(ch, offset, tstr);
 
-	raw_spin_unlock_irqrestore(&priv->lock, flags);
+	spin_unlock_irqrestore(&priv->lock, flags);
 }
 
 bool rz_mtu3_is_enabled(struct rz_mtu3_channel *ch)
···
 	bitpos = rz_mtu3_get_tstr_bit_pos(ch);
 
 	/* start stop register shared by multiple timer channels */
-	raw_spin_lock_irqsave(&priv->lock, flags);
+	spin_lock_irqsave(&priv->lock, flags);
 	tstr = rz_mtu3_shared_reg_read(ch, offset);
-	raw_spin_unlock_irqrestore(&priv->lock, flags);
+	spin_unlock_irqrestore(&priv->lock, flags);
 
 	return tstr & BIT(bitpos);
 }
···
 		return PTR_ERR(ddata->clk);
 
 	reset_control_deassert(priv->rstc);
-	raw_spin_lock_init(&priv->lock);
+	spin_lock_init(&priv->lock);
 	platform_set_drvdata(pdev, ddata);
 
 	for (i = 0; i < RZ_MTU_NUM_CHANNELS; i++) {