treesitter doesn't handle fixed size arrays

Treesitter doesn't highlight fixed sized arrays correctly. 
For examle in 
```
Header header
uint32 height
uint32 width
string distortion_model
float64[] D
float64[9]  K             
float64[9]  R
float64[12] P
uint32 binning_x
uint32 binning_y
RegionOfInterest roi
```

the K, R and P fields are not highlighted