surfaceflinger: minor dumpsys improvements

In the order of importance,

 - fix eglGetConfigAttrib calls
 - mark Zs as relative in minidump
 - dump DisplayDevice wide color states
 - rename pixelformat to defaultPixelFormat in layer state
 - better grouping and indentation for DisplayDevice dump

Bug: 76415976
Test: dumpsys
Change-Id: If9254ffe43cb1de82d562fcc27e828d54eba9387
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index a6e0a9e..e5c220e 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -3981,6 +3981,7 @@
     LayersProto layersProto = dumpProtoInfo(LayerVector::StateSet::Current);
     auto layerTree = LayerProtoParser::generateLayerTree(layersProto);
     result.append(LayerProtoParser::layersToString(std::move(layerTree)).c_str());
+    result.append("\n");
 
     /*
      * Dump Display state
@@ -3993,6 +3994,7 @@
         const sp<const DisplayDevice>& hw(mDisplays[dpy]);
         hw->dump(result);
     }
+    result.append("\n");
 
     /*
      * Dump SurfaceFlinger global state