intel/genxml: Delete empty groups

They serve no purpose other than to just fill empty space in the packet
so each dword has something.  Just disallowing empty groups is a bit
easier on some of the tools.  This does not change the generated packing
headers in any way.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/genxml/gen6.xml

@@ -416,8 +416,6 @@
     <field name="Viewport Matrix Element m30" start="96" end="127" type="float"/>
     <field name="Viewport Matrix Element m31" start="128" end="159" type="float"/>
     <field name="Viewport Matrix Element m32" start="160" end="191" type="float"/>
-    <group count="2" start="192" size="32">
-    </group>
   </struct>
 
   <struct name="BLEND_STATE_ENTRY" length="2">

src/intel/genxml/gen7.xml

@@ -469,8 +469,6 @@
     <field name="X Max Clip Guardband" start="288" end="319" type="float"/>
     <field name="Y Min Clip Guardband" start="320" end="351" type="float"/>
     <field name="Y Max Clip Guardband" start="352" end="383" type="float"/>
-    <group count="4" start="384" size="32">
-    </group>
   </struct>
 
   <struct name="BLEND_STATE_ENTRY" length="2">

src/intel/genxml/gen75.xml

@@ -488,8 +488,6 @@
     <field name="X Max Clip Guardband" start="288" end="319" type="float"/>
     <field name="Y Min Clip Guardband" start="320" end="351" type="float"/>
     <field name="Y Max Clip Guardband" start="352" end="383" type="float"/>
-    <group count="4" start="384" size="32">
-    </group>
   </struct>
 
   <struct name="BLEND_STATE_ENTRY" length="2">

src/intel/genxml/gen8.xml

@@ -1940,8 +1940,6 @@
     <field name="3D Command Opcode" start="24" end="26" type="uint" default="1"/>
     <field name="3D Command Sub Opcode" start="16" end="23" type="uint" default="28"/>
     <field name="DWord Length" start="0" end="7" type="uint" default="7"/>
-    <group count="4" start="32" size="32">
-    </group>
     <field name="8x Sample7 X Offset" start="188" end="191" type="u0.4"/>
     <field name="8x Sample7 Y Offset" start="184" end="187" type="u0.4"/>
     <field name="8x Sample6 X Offset" start="180" end="183" type="u0.4"/>