Add make targets for vGPU host drivers

[shivakunv]

This PR allows one to run the following make commands to build and push vGPU host driver images.

$ VGPU_HOST_DRIVER_VERSION=570.124.06     IMAGE_NAME=nvcr.io/ea-cnt/nv_only/vgpu-manager     make build-vgpuhost-ubuntu22.04
DOCKER_BUILDKIT=1 \
	docker  build --pull \
			 \
			--platform=linux/amd64 \
			--tag nvcr.io/ea-cnt/nv_only/vgpu-manager:570.124.06-ubuntu22.04 \
			--build-arg DRIVER_TYPE=vgpu \
			--build-arg VGPU_LICENSE_SERVER_TYPE=NLS \
			--build-arg DRIVER_BRANCH="570" \
			--build-arg DRIVER_VERSION="570.124.06" \
			--build-arg GOLANG_VERSION="1.24.4" \
			--build-arg CVE_UPDATES="" \
			--build-arg CUDA_VERSION="" \
			 \
			--file /egx/test/gpu-driver-container/vgpu-manager/ubuntu22.04/Dockerfile \
			/egx/test/gpu-driver-container/vgpu-manager/ubuntu22.04


$ VGPU_HOST_DRIVER_VERSION=570.124.06     IMAGE_NAME=nvcr.io/ea-cnt/nv_only/vgpu-manager     make push-vgpuhost-ubuntu22.04

docker push "nvcr.io/ea-cnt/nv_only/vgpu-manager:570.124.06-ubuntu22.04"
The push refers to repository [nvcr.io/ea-cnt/nv_only/vgpu-manager]

[cdesiniotis]

One minor comment, otherwise lgtm. Thanks @shivakunv