panfrost/va: remove swizzle mod from LDEXP

This instruction does not support swizzles. This information is not used
for anything, but will be if we use the instruction tables for
bi_lower_swizzle.

Signed-off-by: Benjamin Lee <benjamin.lee@collabora.com>
Fixes: 316486dd9f ("pan/va: Add initial ISA.xml for Valhall")
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Acked-by: Rebecca Mckeever <rebecca.mckeever@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33637>
(cherry picked from commit 2a70665df7)

.pick_status.json

@@ -24,7 +24,7 @@
         "description": "panfrost/va: remove swizzle mod from LDEXP",
         "nominated": true,
         "nomination_type": 2,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": "316486dd9f6bbd03e7e13655674f1fa91e533b9a",
         "notes": null

src/panfrost/compiler/valhall/ISA.xml

@@ -1816,7 +1816,7 @@
       handling differs from an actual floating-point multiply, so this should
       not be used outside fixed instruction sequences.
     </desc>
-    <src absneg="true" swizzle="true">A</src>
+    <src absneg="true">A</src>
     <src/>
     <roundmode/> <!-- Also has rtna -->
     <!-- Also has infinity handling for arctan -->