[nvidia-390xx-kmod/f31] (5 commits) ...Update to 390.138 release

Summary of changes: 1ed67e1... Update kernel-5.6 patch (*) 6ab9d79... Prepare for kernel 5.7 (*) f1af634... Actually apply patch for kernel-5.7 (*) 967d7a8... Actually apply patch for kernel-5.7 (*) 820f584... Update to 390.138 release (*) (*) This commit already existed in another branch; no separate mail sent