dmaengine: ioat: use PCI core macros for PCIe Capability

[ Upstream commit 8f6707d0

 ]

The PCIe Capability is defined by the PCIe spec, so use the PCI_EXP_DEVCTL
macros defined by the PCI core instead of defining copies in IOAT.  This
makes it easier to find all uses of the PCIe Device Control register.  No
functional change intended.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20230307214615.887354-1-helgaas@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Stable-dep-of: f0dc9fda

 ("dmaengine: ioatdma: Fix error path in ioat3_dma_probe()")
Signed-off-by: Sasha Levin <sashal@kernel.org>