OvmfPkg/VirtioFsDxe: add a shared wrapper for FUSE_UNLINK / FUSE_RMDIR

The FUSE_UNLINK and FUSE_RMDIR commands only differ in the opcode. Add a
common function for wrapping both.

Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20201216211125.19496-25-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>

OvmfPkg/Include/IndustryStandard/VirtioFs.h

@@ -115,6 +115,8 @@ typedef enum {
   VirtioFsFuseOpLookup      =  1,
   VirtioFsFuseOpForget      =  2,
   VirtioFsFuseOpMkDir       =  9,
+  VirtioFsFuseOpUnlink      = 10,
+  VirtioFsFuseOpRmDir       = 11,
   VirtioFsFuseOpOpen        = 14,
   VirtioFsFuseOpRelease     = 18,
   VirtioFsFuseOpFsync       = 20,