remove aliases for deprecated pkg/fsutils

The aliases are included in the 22 release branch, so we can remove them
from master.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

pkg/fsutils/fsutils_linux.go

@@ -1,8 +0,0 @@
-package fsutils // import "github.com/docker/docker/pkg/fsutils"
-
-import "github.com/containerd/continuity/fs"
-
-// SupportsDType returns whether the filesystem mounted on path supports d_type.
-//
-// Deprecated: use github.com/containerd/continuity/fs.SupportsDType
-var SupportsDType = fs.SupportsDType