radesonsi/vcn: update vcn4 tile processing logic

Vcn4 tile number calculation doesn't consider
some input case, which could result in output
bitstream corruption, this fixed the issue.

Not using the number_of_tiles directly but from
calculation. Also change to re-use some macros
from local vcn_5_0.c to ac_vcn_enc.h header file.

Updated vcn4 spec_misc_av1 ip package.

Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Ruijing Dong <ruijing.dong@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29556>

src/gallium/include/pipe/p_video_state.h

@@ -1008,7 +1008,6 @@ struct pipe_av1_enc_picture_desc
    struct pipe_enc_quality_modes quality_modes;
    struct pipe_enc_intra_refresh intra_refresh;
    struct pipe_enc_roi roi;
-   uint32_t num_tiles_in_pic; /* [1, 32], */
    uint32_t tile_rows;
    uint32_t tile_cols;
    unsigned num_tile_groups;