Remove rutabaga_gfx_ffi from workspace

The crate requires special compilation flags that conflict with the
workspace flags.

We may want to consider moving it to common/ so the test runner can
compile it in a separate workspace.

This brings us one step closer to be able to run
`cargo build --workspace` with no excludes.

BUG=b:206689789
TEST=./tools/presubmit

Change-Id: Ice747ced00f81db0a8e05ff2bc43d4d0e323e456
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3453050
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Dennis Kempin <denniskempin@google.com>

Cargo.toml

@@ -64,7 +64,6 @@ members = [
     "qcow_utils",
     "resources",
     "rutabaga_gfx",
-    "rutabaga_gfx/ffi",
     "tpm2",
     "tpm2-sys",
     "usb_sys",

rutabaga_gfx/ffi/Cargo.toml

@@ -24,3 +24,5 @@ vulkano = ["rutabaga_gfx/vulkano"]
 [profile.dev]
 lto = true
 incremental = false
+
+[workspace]

tools/impl/test_config.py

@@ -55,7 +55,6 @@ CRATE_OPTIONS: dict[str, list[TestOption]] = {
     "x86_64": [TestOption.DO_NOT_BUILD_AARCH64, TestOption.DO_NOT_BUILD_ARMHF],
     "sys_util": [TestOption.SINGLE_THREADED],
     "sys_util_core": [TestOption.SINGLE_THREADED],
-    "rutabaga_gfx_ffi": [TestOption.DO_NOT_BUILD],  # b/206689789
     "rutabaga_gfx": [TestOption.DO_NOT_BUILD_ARMHF], #b/210015864
     "vhost": [TestOption.DO_NOT_RUN_ON_FOREIGN_KERNEL],
     "vm_control": [TestOption.DO_NOT_BUILD_ARMHF], #b/210015864