Add utils.h

[realPJL]

Fixes #1776

[realPJL]

I tried the "Create PR" from inside vs code but ig that leaves out the description.

I added utils.h which now includes the #define ARRAY_SIZE and is being included by display.c and device_config.c. I also checked for other implementations of ARRAY_SIZE but haven't found any.

[mutatrum]

There's a build failure, not sure why. Maybe because the filename shadows utils.h in components/asic?

[realPJL]

The simplest solution that comes to mind would be to just rename utils.h to something different (?)

[realPJL]

The other utils.h is inside components/stratum/include/utils.h.

[mutatrum]

Yeah, or just put it in the existing utils.h, that's being included everywhere already.

[realPJL]

device_config.c and display.c do not (yet) include the existing utils.h.
I'd suggest renaming my utils.h to array.h and keeping it in the root directory. That way we can simply add to it if we need more array functions