turnip: Convert the rest of tu_cmd_buffer.c over to the new pack macros.

There are only a couple of hard cases left using pkt4, where the register
number to write is computed.

Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3455>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3455>
1 file changed