Lock virtio-drivers version at 4ee80e5

Author: wyfcyx

os/Cargo.toml

@@ -13,7 +13,7 @@ buddy_system_allocator = "0.6"
 bitflags = "1.2.1"
 xmas-elf = "0.7.0"
 volatile = "0.3"
-virtio-drivers = { git = "https://github.com/rcore-os/virtio-drivers" }
+virtio-drivers = { git = "https://github.com/rcore-os/virtio-drivers", rev = "4ee80e5" }
 k210-pac = { git = "https://github.com/wyfcyx/k210-pac" }
 k210-hal = { git = "https://github.com/wyfcyx/k210-hal" }
 k210-soc = { git = "https://github.com/wyfcyx/k210-soc" }