Kernel and kernel headers version missmatch
<!--
You must use the issue template below when submitting a bug
-->

<!--
If you are having an issue with a certain plugin, please raise the issue on that plugin's project page instead.
-->

<!--
The Homebridge Raspberry Pi image is just Raspbian Linux with Homebridge installed as a service.
If you are facing an issue that is not Homebridge related you should look elsewhere for support.
-->

**Describe The Bug:**
<!-- A clear and concise description of what the bug is. -->

I am trying to install deconz via hb-config, but it is failing because the kernel and kernel header versions missmatch

Tried setting up deconz via hb-config. Getting errors:

build rtc module...
make -C /lib/modules/5.4.72-v7l+/build M=/tmp/raspbee2-rtc-master modules
make[1]: *** /lib/modules/5.4.72-v7l+/build: No such file or directory.  Stop.
make: *** [Makefile:17: build] Error 2
install rtc module...
make[1]: *** /lib/modules/5.4.72-v7l+/build: No such file or directory.  Stop.
could not install rtc module file (did you run make?)
make: *** [Makefile:42: install] Error 1
--2020-12-08 23:06:46--  http://phoscon.de/apt/deconz.pub.key

**To Reproduce:**
<!-- Steps to reproduce the behavior. -->

Try installing deconz via hb-config

**Expected behavior:**
<!-- A clear and concise description of what you expected to happen. -->

Successful setup

**Logs:**

```
Show the logs here.
Remove any sensitive information.
```

**Screenshots:**
<!-- If applicable, add screenshots to help explain your problem. -->

**Environment:**

* **Homebridge Raspberry Pi Image Version**:
* **Node.js Version**:  v14.15.1 <!-- node -v -->
* **NPM Version**: 

v6.14.9
--
<!-- npm -v -->
* **Homebridge Version**: <!-- homebridge -V --> 1.1.6
* **Homebridge Config UI X Plugin Version**: <!-- hb-service -v -->

<!-- Click the "Preview" tab before you submit to ensure the formatting is correct. -->
