panfrost: Remove forced flush on clears

This worked around a bug in oooold versions of Panfrost. Nowadays, its
presence is, at best, *creating* bugs. Let's wack it.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

src/gallium/drivers/panfrost/pan_context.c

@@ -1391,10 +1391,6 @@ panfrost_submit_frame(struct panfrost_context *ctx, bool flush_immediate,
         /* Edge case if screen is cleared and nothing else */
         bool has_draws = ctx->draw_count > 0;
 
-        /* Workaround a bizarre lockup (a hardware errata?) */
-        if (!has_draws)
-                flush_immediate = true;
-
 #ifndef DRY_RUN
         
         bool is_scanout = panfrost_is_scanout(ctx);