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/fsck_unshare_blocks.cpp b/fsck_unshare_blocks.cpp
index 9dc0fd8..e0b2d96 100644
--- a/fsck_unshare_blocks.cpp
+++ b/fsck_unshare_blocks.cpp
@@ -36,7 +36,7 @@
 #include <android-base/unique_fd.h>
 #include <fs_mgr/roots.h>
 
-#include "otautil/roots.h"
+#include "recovery_utils/roots.h"
 
 static constexpr const char* SYSTEM_E2FSCK_BIN = "/system/bin/e2fsck_static";
 static constexpr const char* TMP_E2FSCK_BIN = "/tmp/e2fsck.bin";