pan/bi: Skip psuedo sources in ISA.xml

The second staging register source for the +BLEND instruction should
not be packed nor disassembled, so skip it when include_pseudo is not
set.

Fixes: 795638767d ("pan/bi: Use fused dual source blending")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15250>
(cherry picked from commit 66a604efb5)

.pick_status.json

@@ -571,7 +571,7 @@
         "description": "pan/bi: Skip psuedo sources in ISA.xml",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": "795638767d142a58b76c91a0719e42536435320f"
     },

src/panfrost/bifrost/bifrost_isa.py

@@ -143,6 +143,9 @@ def parse_instruction(ins, include_pseudo):
         common['exact'] = parse_exact(ins)
 
     for src in ins.findall('src'):
+        if src.attrib.get('pseudo', False) and not include_pseudo:
+            continue
+
         mask = int(src.attrib['mask'], 0) if ('mask' in src.attrib) else 0xFF
         common['srcs'].append([int(src.attrib['start'], 0), mask])