SF: Plumb physical display IDs to libgui

This CL replaces ISurfaceComposer::{eDisplayIdMain,eDisplayIdHdmi} with
the stable 64-bit display IDs generated by SF. Note that the 64-bit IDs
fall back to the old values if the HWC API for display identification is
not supported.

Bug: 74619554
Test: LocalDisplayAdapter and Choreographer receive 64-bit IDs
Test: 64-bit IDs fall back to 0 and 1 on HWC 2.2 and below
Change-Id: I3c08eff6eb8bb179ecce596ab2820a2aa44c8649
diff --git a/cmds/flatland/GLHelper.cpp b/cmds/flatland/GLHelper.cpp
index 62d2fa1..d398559 100644
--- a/cmds/flatland/GLHelper.cpp
+++ b/cmds/flatland/GLHelper.cpp
@@ -222,9 +222,9 @@
 }
 
 bool GLHelper::computeWindowScale(uint32_t w, uint32_t h, float* scale) {
-    sp<IBinder> dpy = mSurfaceComposerClient->getBuiltInDisplay(0);
+    const sp<IBinder> dpy = mSurfaceComposerClient->getInternalDisplayToken();
     if (dpy == nullptr) {
-        fprintf(stderr, "SurfaceComposer::getBuiltInDisplay failed.\n");
+        fprintf(stderr, "SurfaceComposer::getInternalDisplayToken failed.\n");
         return false;
     }