nir: Don't include u_format.h in nir.h, it's not actually used.

Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33439>

src/compiler/nir/nir.h

@@ -36,7 +36,6 @@
 #include "util/bitset.h"
 #include "util/compiler.h"
 #include "util/enum_operators.h"
-#include "util/format/u_format.h"
 #include "util/hash_table.h"
 #include "util/list.h"
 #include "util/log.h"