MIPS: SNI: pcimt: Guard sni_controller with CONFIG_PCI

Fixes the following build problem:

arch/mips/sni/pcimt.c:188:30: error: 'sni_controller'
defined but not used [-Werror=unused-variable]
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Acked-by: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5547/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/sni/pcimt.c

@@ -185,6 +185,7 @@ static void __init sni_pcimt_resource_init(void)
 
 extern struct pci_ops sni_pcimt_ops;
 
+#ifdef CONFIG_PCI
 static struct pci_controller sni_controller = {
 	.pci_ops	= &sni_pcimt_ops,
 	.mem_resource	= &sni_mem_resource,
@@ -193,6 +194,7 @@ static struct pci_controller sni_controller = {
 	.io_offset	= 0x00000000UL,
 	.io_map_base	= SNI_PORT_BASE
 };
+#endif
 
 static void enable_pcimt_irq(struct irq_data *d)
 {