layers: LX160, Validate Descriptor Set Image Aspects

Validated that Descriptor Sets do not have both the STENCIL and
DEPTH aspect bits set in their imageViews.
diff --git a/layers/draw_state.h b/layers/draw_state.h
old mode 100644
new mode 100755
index 47145cb..86c84a0
--- a/layers/draw_state.h
+++ b/layers/draw_state.h
@@ -70,6 +70,7 @@
     DRAWSTATE_CLEAR_CMD_BEFORE_DRAW,            // Clear cmd issued before any Draw in CmdBuffer, should use RenderPass Ops instead
     DRAWSTATE_BEGIN_CB_INVALID_STATE,           // Primary/Secondary CB created with mismatched FB/RP information
     DRAWSTATE_VIEWPORT_SCISSOR_MISMATCH,        // Count for viewports and scissors mismatch and/or state doesn't match count
+    DRAWSTATE_INVALID_IMAGE_ASPECT,             // Image aspect is invalid for the current operation
     DRAWSTATE_INVALID_EXTENSION,
 } DRAW_STATE_ERROR;