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radeonsi/vcn: fix loop filter across slices

Boyuan Zhang requested to merge boyzhang/mesa:fix-hevc-loop-filter-across-slices into main

What does this MR do and why?

According to HEVC SPEC, PPS header should use pps_loop_filter_across_slices_enabled_flag
as a global control to determine whether in-loop filtering operations can be done across
the slices boundaries in a frame. Same apply to slice header, where one of the condition
to determine slice level enablement should also be using pps flag.

The previous codes was using the wrong flag (slice_loop_filter_across_slices_enabled_flag),
which is for individual (per-slice) control.
Edited by Boyuan Zhang

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