ARM: BCM63xx: fix an error path in bcm63xx_pmb_power_on_cpu()

We need to unlock and unmap some resourses before returning.

Fixes: 3f2a43c98d ('ARM: BCM63xx: Add secondary CPU PMB initialization sequence')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/mach-bcm/bcm63xx_pmb.c

@@ -150,7 +150,7 @@ int bcm63xx_pmb_power_on_cpu(struct device_node *dn)
 	 */
 	ret = bpcm_rd(base, addr, ARM_CONTROL, &ctrl);
 	if (ret)
-		return ret;
+		goto out;
 
 	if (ctrl & CPU_RESET_N(cpu)) {
 		pr_info("PMB: CPU%d is already powered on\n", cpu);