add pve-vgpu-helper

Author: jiangcuo

.gitmodules

@@ -227,3 +227,6 @@
 [submodule "packages/proxmox-ve-rs/proxmox-ve-rs"]
 	path = packages/proxmox-ve-rs/proxmox-ve-rs
 	url = https://git.proxmox.com/git/proxmox-ve-rs.git
+[submodule "packages/pve-vgpu-helper/pve-vgpu-helper"]
+	path = packages/pve-vgpu-helper/pve-vgpu-helper
+	url = https://git.proxmox.com/git/pve-vgpu-helper.git