ANDROID: make virtio_pci_legacy_dev a GKI module

It was removed from GKI modules back in May [1], but that had the side
effect of disabling legacy dev support in virtio_pci.ko [2], which
requires CONFIG_VIRTIO_PCI_LEGACY at the time of building GKI modules.

As a result, after updating prebuilts, virtio_pci.ko no longer depends
on virtio_pci_legacy_dev.ko, and doesn't probe for legacy devices.

This manifested as wifi stopping to work in the goldfish emulator
(b/381881708) - the wlan0 interface was not getting assigned, and no
data was transmitted.

[1] https://android-review.git.corp.google.com/c/kernel/common-modules/virtual-device/+/3081450
[2] https://cs.android.com/android/kernel/common/+/android-mainline:drivers/virtio/virtio_pci_common.h;l=146;drc=97ee04feb682c906a1fa973ebe586fe91567d165

Bug: 381881708
Test: build x86_64 kernel, replace virtio_pci.ko in
Test: kernel/prebuilts/6.6/x86_64/
Test: lunch sdk_phone64_x86_64-trunk_staging-eng && m && emulator
Test: adb shell ifconfig  # notice IP address getting assigned
Change-Id: Ic2141d8c85d25830a5113dd74d853ebf52df3b02
Signed-off-by: Marcin Radomski <dextero@google.com>

BUILD.bazel

@@ -968,7 +968,6 @@ _ROCKPI4_MODULE_OUTS = [
     "drivers/thermal/rockchip_thermal.ko",
     "drivers/usb/host/ohci-hcd.ko",
     "drivers/usb/host/ohci-platform.ko",
-    "drivers/virtio/virtio_pci_legacy_dev.ko",
     "net/core/failover.ko",
 ]
 

arch/arm64/configs/gki_defconfig

@@ -568,7 +568,6 @@ CONFIG_VIRT_DRIVERS=y
 CONFIG_ARM_PKVM_GUEST=y
 CONFIG_MTK_GZVM=m
 CONFIG_VIRTIO_PCI=m
-# CONFIG_VIRTIO_PCI_LEGACY is not set
 CONFIG_VIRTIO_BALLOON=m
 CONFIG_VHOST_VSOCK=y
 CONFIG_STAGING=y

arch/x86/configs/gki_defconfig

@@ -526,7 +526,6 @@ CONFIG_DMABUF_HEAPS=y
 CONFIG_DMABUF_SYSFS_STATS=y
 CONFIG_UIO=y
 CONFIG_VIRTIO_PCI=m
-# CONFIG_VIRTIO_PCI_LEGACY is not set
 CONFIG_VIRTIO_BALLOON=m
 CONFIG_VHOST_VSOCK=y
 CONFIG_STAGING=y

modules.bzl

@@ -49,6 +49,7 @@ _COMMON_GKI_MODULES_LIST = [
     "drivers/usb/serial/usbserial.ko",
     "drivers/virtio/virtio_balloon.ko",
     "drivers/virtio/virtio_pci.ko",
+    "drivers/virtio/virtio_pci_legacy_dev.ko",
     "drivers/virtio/virtio_pci_modern_dev.ko",
     "fs/netfs/netfs.ko",
     "kernel/kheaders.ko",