radeonsi: don't merge SET_* packets that have a different index in si_pm4_state

Oops.

Fixes: c8e2c6faf64 ("radeonsi: use SET_SH_REG_INDEX with index=3 for registers containing CU_EN")

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21641>
(cherry picked from commit 3a26d2b1a7f81ae719037cd734ac776a3c6ab65b)
3 files changed