MdeModulePkg/NonDiscoverablePciDeviceDxe: use standard PCI_MAX_BAR macro

MdeModulePkg/NonDiscoverablePciDeviceDxe: use standard PCI_MAX_BAR macro

NonDiscoverablePciDeviceDxe currently #defines the module-internal
PCI_MAX_BARS macro, with value 6 (and type "int").

Remove this private macro definition, and adopt PCI_MAX_BAR from
"MdePkg/Include/IndustryStandard/Pci22.h". Both the value and the type
remain unchanged (the standard PCI_MAX_BAR macro expands to 0x0006).

"NonDiscoverablePciDeviceIo.h" gets the definition of PCI_MAX_BAR via its
existent #include <IndustryStandard/Pci.h> directive.

Build-tested only.

Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Cc: Ray Ni <ray.ni@intel.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20200409113017.18233-1-lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>