devices: fs: Add fuse constants and struct definitions

Add the constants and struct definitions from the kernel fuse interface.
These bindings are manually generated from `include/uapi/linux/fuse.h`
in the kernel repo.

BUG=b:136128319
TEST=none;  these aren't used anywhere yet

Change-Id: I03d11bc55eca6b8269f1e63a1187ef458ee16f28
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1705655
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Stephen Barber <smbarber@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
Commit-Queue: Chirantan Ekbote <chirantan@chromium.org>

Cargo.lock

@@ -56,6 +56,11 @@ dependencies = [
  "syn 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "bitflags"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "cc"
 version = "1.0.25"
@@ -138,6 +143,7 @@ version = "0.1.0"
 dependencies = [
  "audio_streams 0.1.0",
  "bit_field 0.1.0",
+ "bitflags 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "data_model 0.1.0",
  "disk 0.1.0",
  "enumn 0.1.0",
@@ -601,6 +607,7 @@ dependencies = [
 ]
 
 [metadata]
+"checksum bitflags 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3d155346769a6855b86399e9bc3814ab343cd3d62c7e985113d46a0ec3c281fd"
 "checksum cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)" = "f159dfd43363c4d08055a07703eb7a3406b0dac4d0584d96965a3262db3c9d16"
 "checksum cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "0c4e7bb64a8ebb0d856483e1e682ea3422f883c5f5615a90d51a2c82fe87fdd3"
 "checksum getopts 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)" = "0a7292d30132fb5424b354f5dc02512a86e4c516fe544bb7a25e7f266951b797"

devices/Cargo.toml

@@ -14,6 +14,7 @@ x = ["gpu_display/x"]
 [dependencies]
 audio_streams = "*"
 bit_field = { path = "../bit_field" }
+bitflags = "1"
 data_model = { path = "../data_model" }
 disk = { path = "../disk" }
 enumn = { path = "../enumn" }