ANDROID: Manual revert of vsock buffer sizing from commit 1fc8b74d

Commit 1fc8b74d ("vsock/virtio: Resize receive buffers so that
each SKB fits in a 4K page") changed VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE
to use SKB_WITH_OVERHEAD, which breaks Battlestar functionality.

This commit manually reverts the definition of
VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE back to (1024 * 4).

Bug: 447259727

Test: Tested gameplay on Battlestar with generated kernel prebuilts.
Change-Id: Ibedf839ff7a9e94b04545ab2037657c83f3a42d4

Change-Id: I63301c41f2b610b39340b49bf45ec7f1b562c7c2
Signed-off-by: Kriti Singh <kritisn@google.com>