OvmfPkg/QemuBootOrderLib: clean up translation of virtio-net over MMIO
OvmfPkg/QemuBootOrderLib: clean up translation of virtio-net over MMIO

The "/MAC(" suffix of the translated UEFI devpath prefix is unnecessary
for matching, because the virtio-mmio base address in VenHwString is
unique anyway. Furthermore, the partial string "MAC(" cannot be processed
by ConvertTextToDevicePath(), which will become relevant later in this
series. Remove "/MAC(".

While at it, remove a bogus comment on PCI.

Cc: Ard Biesheuvel <66d3c5fdaeea7ff1f996ad04f2c45e08ab38e2f5@linaro.org>
Cc: Jordan Justen <a79006884ba9cf5f4f7fcbb92a15b208780d8c97@intel.com>
Cc: Shannon Zhao <d06ae2e8bbeb9d95a576b27f5f81ec3a63d8c3e4@huawei.com>
Cc: Xiang Zheng <5af816d6521acd775e9509bdc9f9cc4d6ff0d56f@linaro.org>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <7437296077edea1cb64451c122c4dac071f0cfbc@redhat.com>
Tested-by: Ard Biesheuvel <66d3c5fdaeea7ff1f996ad04f2c45e08ab38e2f5@linaro.org> # ArmVirtQemu
Reviewed-by: Ard Biesheuvel <66d3c5fdaeea7ff1f996ad04f2c45e08ab38e2f5@linaro.org>
Tested-by: Xiang Zheng <5af816d6521acd775e9509bdc9f9cc4d6ff0d56f@linaro.org>

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