otautil: Factor out the utils that're private to recovery.

A number of utility functions are intended for serving recovery's own
use. Exposing them via libotautil (which is a static lib) would pass the
dependencies onto libotautil's users (e.g. recovery image, updater, host
simulator, device-specific recovery UI/updater extensions etc). This CL
finds a new home for the utils that are private to recovery.

Test: mmma bootable/recovery
Change-Id: I575e97ad099b85fe1c1c8c7c9458a5a43d4e11e1
diff --git a/tests/Android.bp b/tests/Android.bp
index 3335c0b..5b881e3 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -117,6 +117,7 @@
         "librecovery_ui",
         "libfusesideload",
         "libminui",
+        "librecovery_utils",
         "libotautil",
         "libupdater_device",
         "libupdater_core",