compiler/blob: Make some parameters void instead of uint8_t

compiler/blob: Make some parameters void instead of uint8_t

There are certain advantages to using uint8_t internally such as
well-defined arithmetic on all platforms.  However, interfaces that
work in terms of raw data should use a void* type.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>