Delete unused internal/fdo package

This is a leftover from the `osbuild/images` split`.

Signed-off-by: Tomáš Hozza <thozza@redhat.com>

internal/fdo/fdo.go

@@ -1,15 +0,0 @@
-package fdo
-
-import "github.com/osbuild/osbuild-composer/internal/blueprint"
-
-type Options struct {
-	ManufacturingServerURL string
-	DiunPubKeyInsecure     string
-	DiunPubKeyHash         string
-	DiunPubKeyRootCerts    string
-}
-
-func FromBP(bpFDO blueprint.FDOCustomization) *Options {
-	fdo := Options(bpFDO)
-	return &fdo
-}