Upgrade rust/vmm_vhost to fff997dda0625bd6f7c33bc0d79653c91b41b6c7

Test: make
Change-Id: I1911c42bc5dd48d381ad1978a3d21136233f4712
diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644
index bda97eb..0000000
--- a/.gitmodules
+++ /dev/null
@@ -1,3 +0,0 @@
-[submodule "rust-vmm-ci"]
-	path = rust-vmm-ci
-	url = https://github.com/rust-vmm/rust-vmm-ci.git
diff --git a/Cargo.toml b/Cargo.toml
index 64bfb5b..94a7f45 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,10 +21,13 @@
 [dependencies]
 bitflags = ">=1.0.1"
 libc = ">=0.2.39"
-
-sys_util = { path = "../../../external/crosvm/sys_util" } # provided by ebuild
-tempfile = { path = "../../../external/crosvm/tempfile" } # provided by ebuild
+sys_util = "*"
+tempfile = "*"
 vm-memory = { version = "0.2.0", optional = true }
 
 [dev-dependencies]
 vm-memory = { version = "0.2.0", features=["backend-mmap"] }
+
+[patch.crates-io]
+sys_util = { path = "../../../external/crosvm/sys_util" } # ignored by ebuild
+tempfile = { path = "../../../external/crosvm/tempfile" } # ignored by ebuild
diff --git a/METADATA b/METADATA
index 798081c..8d5aa99 100644
--- a/METADATA
+++ b/METADATA
@@ -9,11 +9,11 @@
     type: GIT
     value: "https://chromium.googlesource.com/chromiumos/third_party/rust-vmm/vhost"
   }
-  version: "eaca5d36a2701c99b354ab5bc0954a78dfc9ff4f"
+  version: "fff997dda0625bd6f7c33bc0d79653c91b41b6c7"
   license_type: NOTICE
   last_upgrade_date {
     year: 2021
-    month: 5
-    day: 19
+    month: 8
+    day: 9
   }
 }