drm/i915/vdsc: Remove FIXME in intel_dsc_compute_config

Remove the FIXME and the code related to it as after verification
it does seem the previous values were typos and no hardware spec
mentions using these particular rc_params.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230626130555.2391750-1-suraj.kandpal@intel.com