PCI/MSI: Remove pci_enable_msi_block_auto()

The new pci_msi_vec_count() interface makes pci_enable_msi_block_auto()
superfluous.

Drivers can use pci_msi_vec_count() to learn the maximum number of MSIs
supported by the device, and then call pci_enable_msi_block().

pci_enable_msi_block_auto() was introduced recently, and its only user is
the AHCI driver, which is also updated by this change.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Tejun Heo <tj@kernel.org>

diff --cc Documentation/PCI/MSI-HOWTO.txt
Simple merge

diff --cc drivers/ata/ahci.c
Simple merge

diff --cc drivers/pci/msi.c
Simple merge

diff --cc include/linux/pci.h
Simple merge