Kernels are not compiled with V4L2 support

[Dan]

 * Distribution: VM Distribution is Ubuntu 22.04 x86_64, Host Distribution is Ubuntu 22.04 x86_64

# Issue description

I can't install the v4l2loopback kernel modules in the VM because the kernel was compiled without v4l2 support. Please compile the kernel with v4l2 support or tell me how to do this. Please see this [relevant issue](https://github.com/umlaeute/v4l2loopback/issues/59#issuecomment-351082960) in v4l2loopback alotting to kernel compilation without v4l2 support

# Steps to reproduce

 1. `lxc launch ubuntu:22.04 ubuntu-vm --vm`
 2. `lxc exec ubuntu-vm -- su - ubuntu`
 3. `sudo apt update`
 4. `sudo apt install -y gcc make build-essential`
 5. `git clone https://github.com/umlaeute/v4l2loopback`
 6. `cd v4l2loopback`
 7. `make`

# Information to attach

```
ubuntu@ubuntu-vm:~/doc/v4l2loopback$ make
Building v4l2-loopback driver...
make -C /lib/modules/`uname -r`/build M=/home/ubuntu/doc/v4l2loopback KCPPFLAGS="-DSNAPSHOT_VERSION='"0.12.7-398-g5bb9bed"'" modules
make[1]: Entering directory '/usr/src/linux-headers-5.15.0-1044-kvm'
  CC [M] /home/ubuntu/doc/v4l2loopback/v4l2loopback.o
  MODPOST /home/ubuntu/doc/v4l2loopback/Module.symvers
ERROR: modpost: "video_ioctl2" [/home/ubuntu/doc/v4l2loopback/v4l2loopback.ko] undefined!
ERROR: modpost: "v4l2_event_unsubscribe" [/home/ubuntu/doc/v4l2loopback/v4l2loopback.ko] undefined!
ERROR: modpost: "v4l2_event_pending" [/home/ubuntu/doc/v4l2loopback/v4l2loopback.ko] undefined!
ERROR: modpost: "v4l2_fh_add" [/home/ubuntu/doc/v4l2loopback/v4l2loopback.ko] undefined!
ERROR: modpost: "v4l2_fh_init" [/home/ubuntu/doc/v4l2loopback/v4l2loopback.ko] undefined!
ERROR: modpost: "v4l2_format_info" [/home/ubuntu/doc/v4l2loopback/v4l2loopback.ko] undefined!
ERROR: modpost: "v4l2_fh_exit" [/home/ubuntu/doc/v4l2loopback/v4l2loopback.ko] undefined!
ERROR: modpost: "v4l2_fh_del" [/home/ubuntu/doc/v4l2loopback/v4l2loopback.ko] undefined!
ERROR: modpost: "video_devdata" [/home/ubuntu/doc/v4l2loopback/v4l2loopback.ko] undefined!
ERROR: modpost: "__video_register_device" [/home/ubuntu/doc/v4l2loopback/v4l2loopback.ko] undefined!
WARNING: modpost: suppressed 14 unresolved symbol warnings because there were too many)
make[2]: *** [scripts/Makefile.modpost:133: /home/ubuntu/doc/v4l2loopback/Module.symvers] Error 1
make[2]: *** Deleting file '/home/ubuntu/doc/v4l2loopback/Module.symvers'
make[1]: *** [Makefile:1830: modules] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.15.0-1044-kvm'
make: *** [Makefile:53: v4l2loopback.ko] Error 2
```