Raspberry Pi 4 processor not correctly being reported

As per title. Also CPU speed is also not propery reported.

```
System Uptime	57 minutes
Operating System	Ubuntu 20.04.3 LTS aarc
Kernel	5.4.0-1042-raspi
File Handles	1920 of 9223372036854775807
Processes	184
Sessions	2
CPU Model	N/A
CPU Speed	1x 0 MHz
```