freedreno/a5xx+: Skip compiling the old gmem blit programs.

Saves a bunch of noise for me to sort through in IR3_SHADER_DEBUG=vs,fs
shader-db/run <single shader_test>.  I found that we were crashing on
destroy of NULL programs in fd_prog_fini, so I replicated the gpu_id < 300
early exit from fd_prog_init() down to _fini as well.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4538>
1 file changed