PCI/MSI: Rename msi_set_enable(), msix_clear_and_set_ctrl()

Rename msi_set_enable() to pci_msi_set_enable() and
msix_clear_and_set_ctrl() to pci_msix_clear_and_set_ctrl().

No functional change.

[bhelgaas: changelog, split into separate patch]
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Fam Zheng <famz@redhat.com>

(cherry picked from commit 61b64abd399fa4b15ac649ad93b453d2a8569314)
Signed-off-by: Alex Shi <alex.shi@linaro.org>

 Conflicts solution:
	drivers/pci/msi.c /* force remove contents of pci_msi_init_pci_dev */