image size on 20.xx builds -- what about a new SMALL target

[Bjoern Franke]

Hi,

> 
> Keep in mind master sets CONFIG_KERNEL_KALLSYMS whereas stable builds
> do not. That alone makes a bit of a size difference (never checked how
> much). Other than that, 5.4 needs more space than 4.14 does (again, how
> much exactly I have not quantified).

Thanks for that hint. Disabling CONFIG_KERNEL_KALLSYMS and 
CONFIG_KERNEL_DEBUG_KERNEL saves around 100kb and 400kb uncompressed in 
case of the ArcherC50v1.

Regards