[RESEND PATCHv4 1/3] fpga: altera-cvp: Discover Vendor Specific offset

From: Thor Thayer Newer Intel FPGAs have different Vendor Specific offsets than legacy parts. Use PCI discovery to find the CvP registers. Since the register positions remain the same, change the hard coded address to a more flexible way of indexing registers from the offset. Adding new PCI read

[PATCHv4 1/3] fpga: altera-cvp: Discover Vendor Specific offset

From: Thor Thayer Newer Intel FPGAs have different Vendor Specific offsets than legacy parts. Use PCI discovery to find the CvP registers. Since the register positions remain the same, change the hard coded address to a more flexible way of indexing registers from the offset. Adding new PCI read