radv: remove incorrect comment about compressed writes to HTILE on GFX10+

radv: remove incorrect comment about compressed writes to HTILE on GFX10+

This seems to be unsupported.
COMPRESSION_EN=1 and WRITE_COMPRESS_ENABLE=1 don't update HTILE
with image stores.

Note that there is no issue because depth/stencil images will be
decompressed for image stores, and TC-compat HTILE is disabled.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12450>