Revert "Remove qrngd"

* Bring this back. It improves boot time on several devices. The
   built-in seeder is oneshot.

This reverts commit 89b023b691.

Change-Id: Ic9e272b7a5d797d06e9a3109328ef6aa0a13b172

default.xml

@@ -227,6 +227,7 @@
   <project path="external/protobuf" name="CyanogenMod/android_external_protobuf" groups="pdk" />
   <project path="external/qemu" name="CyanogenMod/android_external_qemu" />
   <project path="external/qemu-pc-bios" name="CyanogenMod/android_external_qemu-pc-bios" />
+  <project path="external/qrngd" name="CyanogenMod/android_external_qrngd" />
   <project path="external/regex-re2" name="CyanogenMod/android_external_regex-re2" />
   <project path="external/replicaisland" name="CyanogenMod/android_external_replicaisland" />
   <project path="external/robolectric" name="platform/external/robolectric" remote="aosp" revision="refs/tags/android-4.4.2_r1" />