panfrost: Remove FBD pointer on Bifrost XML

It's a pointer to a thread storage descriptor, not a framebuffer
descriptor. Unlike Midgard, these don't have to alias. The FBD pointer
was unused anyway, so remove it to reduce noise in pandecode dumps.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14543>

src/panfrost/lib/genxml/v6.xml

@@ -628,7 +628,6 @@
     <field name="Viewport" size="64" start="24:0" type="address"/>
     <field name="Occlusion" size="64" start="26:0" type="address"/>
     <field name="Thread Storage" size="64" start="28:0" type="address"/>
-    <field name="FBD" size="64" start="28:0" type="address"/>
   </struct>
 
   <struct name="Surface" align="8">

src/panfrost/lib/genxml/v7.xml

@@ -671,7 +671,6 @@
     <field name="Viewport" size="64" start="24:0" type="address"/>
     <field name="Occlusion" size="64" start="26:0" type="address"/>
     <field name="Thread Storage" size="64" start="28:0" type="address"/>
-    <field name="FBD" size="64" start="28:0" type="address"/>
   </struct>
 
   <struct name="Surface" align="8">