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/recovery.cpp b/recovery.cpp
index 4862dfc..682ddbc 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -55,12 +55,12 @@
 #include "install/wipe_device.h"
 #include "otautil/boot_state.h"
 #include "otautil/error_code.h"
-#include "otautil/logging.h"
 #include "otautil/paths.h"
-#include "otautil/roots.h"
 #include "otautil/sysutil.h"
 #include "recovery_ui/screen_ui.h"
 #include "recovery_ui/ui.h"
+#include "recovery_utils/logging.h"
+#include "recovery_utils/roots.h"
 
 static constexpr const char* COMMAND_FILE = "/cache/recovery/command";
 static constexpr const char* LAST_KMSG_FILE = "/cache/recovery/last_kmsg";