Move package verifier from libinstall to libotautil

So it can be used by device-specific codes.

Bug: 184693830
Test: m; atest recovery_unit_test
Change-Id: I5885334c1bd04214c9cc295f2337306261a1735c
diff --git a/tests/fuzz/verify_package_fuzzer.cpp b/tests/fuzz/verify_package_fuzzer.cpp
index baa44e0..36c8534 100644
--- a/tests/fuzz/verify_package_fuzzer.cpp
+++ b/tests/fuzz/verify_package_fuzzer.cpp
@@ -17,7 +17,7 @@
 #include "fuzzer/FuzzedDataProvider.h"
 
 #include "install/install.h"
-#include "install/package.h"
+#include "otautil/package.h"
 #include "recovery_ui/stub_ui.h"
 
 std::unique_ptr<Package> CreatePackage(std::vector<uint8_t>& content) {