gpu: vivante: Remove user-space definitions from headers

All not used in kernel code at all, not even optionally.
Also move lone gcoMATH function as inlined function to header.
Delete completely unused gc_hal_dump.h and gc_hal_profiler_internal.h.
gpu: vivante: Remove profile filename setting

This was pretty useless. The kernel was only used to hold a filename
but didn't do anything with it.