SF: Clean up DisplayDeviceState

The DisplayDevice::DisplayType in DisplayDeviceState will be replaced
with a DisplayId in a follow-up CL, so this CL removes unnecessary
constructors and renames displayId to sequenceId.

Bug: 74619554
Test: Build
Change-Id: I994042188299d59a62a368c12455d04891d07298
diff --git a/services/surfaceflinger/DisplayDevice.cpp b/services/surfaceflinger/DisplayDevice.cpp
index 33e57cd..b7fa6cb 100644
--- a/services/surfaceflinger/DisplayDevice.cpp
+++ b/services/surfaceflinger/DisplayDevice.cpp
@@ -507,18 +507,6 @@
     result.append(surfaceDump);
 }
 
-std::atomic<int32_t> DisplayDeviceState::nextDisplayId(1);
-
-DisplayDeviceState::DisplayDeviceState(DisplayDevice::DisplayType type, bool isSecure)
-    : type(type),
-      layerStack(DisplayDevice::NO_LAYER_STACK),
-      orientation(0),
-      width(0),
-      height(0),
-      isSecure(isSecure)
-{
-    viewport.makeInvalid();
-    frame.makeInvalid();
-}
+std::atomic<int32_t> DisplayDeviceState::sNextSequenceId(1);
 
 }  // namespace android