pan/midgard, bifrost: Set lower_fdph = true

fdph instructions show up in some desktop GL shaders.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
diff --git a/src/panfrost/bifrost/bifrost_compile.h b/src/panfrost/bifrost/bifrost_compile.h
index e687f64..d941b4a 100644
--- a/src/panfrost/bifrost/bifrost_compile.h
+++ b/src/panfrost/bifrost/bifrost_compile.h
@@ -49,6 +49,7 @@
         .lower_isign = true,
         .lower_fsign = true,
         .lower_ffract = true,
+        .lower_fdph = true,
         .lower_pack_half_2x16 = true,
         .lower_pack_unorm_2x16 = true,
         .lower_pack_snorm_2x16 = true,