usb: bdc: Remove the BDC PCI driver

usb: bdc: Remove the BDC PCI driver

The BDC PCI driver was only used for design verification with
an PCI/FPGA board. The board no longer exists and is not in use
anywhere. All instances of this core now exist as a memory mapped
device on the platform bus.

NOTE: This only removes the PCI driver and does not remove the
platform driver.

Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Al Cooper <alcooperx@gmail.com>
Link: https://lore.kernel.org/r/20210115213142.35003-1-alcooperx@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>