PCI: mvebu: Make mvebu_pci_bridge_emul_ops static

PCI: mvebu: Make mvebu_pci_bridge_emul_ops static

The mvebu_pci_bridge_emul_ops is not exported outside
of the driver, so make it static to avoid the following
sparse warning:

drivers/pci/controller/pci-mvebu.c:557:28: warning: symbol 'mvebu_pci_bridge_emul_ops' was not declared. Should it be static?

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Andrew Murray <andrew.murray@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-pci@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org