SF: Upgrade to Composer HAL 2.4

Add plumbing for getDisplayCapabilities and getDisplayConnectionType.
The only functional change is that getDisplayType is no longer called
on hotplug.

Bug: 135929065
Bug: 134771872
Test: Rev HAL to 2.4 on crosshatch
Test: libsurfaceflinger_unittest
Change-Id: Ib2c0383397acef9cde860dd64182213ae7cbb286
diff --git a/libs/vr/libvrflinger/Android.bp b/libs/vr/libvrflinger/Android.bp
index 2053344..04493f0 100644
--- a/libs/vr/libvrflinger/Android.bp
+++ b/libs/vr/libvrflinger/Android.bp
@@ -40,6 +40,7 @@
     "android.hardware.graphics.composer@2.1",
     "android.hardware.graphics.composer@2.2",
     "android.hardware.graphics.composer@2.3",
+    "android.hardware.graphics.composer@2.4",
     "libbinder",
     "libbase",
     "libbufferhubqueue",