intel: Remove unnecessary dualBlendMode enable

bug #12925
header version: r29511
Can determine dualBlendModeEnable from blend information provided.
Integrate review feedback.
diff --git a/icd/intel/pipeline.h b/icd/intel/pipeline.h
index 5983f9c..3e42f13 100644
--- a/icd/intel/pipeline.h
+++ b/icd/intel/pipeline.h
@@ -211,6 +211,8 @@
     uint32_t cmds[INTEL_PSO_CMD_ENTRIES];
     uint32_t cmd_len;
 
+    bool dual_source_blend_enable;
+
     /* The following are only partial HW commands that will need
      * more processing before sending to the HW
      */