gallium: add key size to the structure pipe_picture_desc

Signed-off-by: Feng Jiang <jiangfeng@kylinos.cn>
Reviewed-by: Liming Sun <sunliming@kylinos.cn>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17157>

src/gallium/frontends/va/picture.c

@@ -283,6 +283,7 @@ handleVAProtectedSliceDataBufferType(vlVaContext *context, vlVaBuffer *buf)
 
 	context->desc.base.decrypt_key = CALLOC(1, drm_key_size);
 	memcpy(context->desc.base.decrypt_key, encrypted_data, drm_key_size);
+	context->desc.base.key_size = drm_key_size;
 	context->desc.base.protected_playback = true;
 }
 

src/gallium/include/pipe/p_video_state.h

@@ -137,6 +137,7 @@ struct pipe_picture_desc
    enum pipe_video_entrypoint entry_point;
    bool protected_playback;
    uint8_t *decrypt_key;
+   uint32_t key_size;
    enum pipe_format input_format;
    enum pipe_format output_format;
 };