ata: ahci_brcm: Fix compilation warning

When compiling with clang and W=1, the following warning is generated:

drivers/ata/ahci_brcm.c:451:18: error: cast to smaller integer type
'enum brcm_ahci_version' from 'const void *'
[-Werror,-Wvoid-pointer-to-enum-cast]
        priv->version = (enum brcm_ahci_version)of_id->data;
                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fix this by using a cast to unsigned long to match the "void *" type
size of of_id->data.

Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>

drivers/ata/ahci_brcm.c

@@ -448,7 +448,7 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 	if (!of_id)
 		return -ENODEV;
 
-	priv->version = (enum brcm_ahci_version)of_id->data;
+	priv->version = (unsigned long)of_id->data;
 	priv->dev = dev;
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "top-ctrl");