Use apexd to set up chroot apex dir

Directly including elements of apexd into the otapreopt_chroot binary
has caused issues when apexd and installd fall out of sync. To avoid
this happening in the future move all apex setup into the apexd
binary and invoke it.

Bug: 181182967
Test: Manual OTA of blueline

Change-Id: I70ecff434e01e543045800ff9f8ff6b567530c33
diff --git a/cmds/installd/Android.bp b/cmds/installd/Android.bp
index cf23f8a..d09d3e8 100644
--- a/cmds/installd/Android.bp
+++ b/cmds/installd/Android.bp
@@ -189,8 +189,8 @@
         "liblog",
         "libutils",
     ],
-    static_libs: [
-        "libapexd",
+    required: [
+      "apexd"
     ],
 }