Move utils for reading dict to policyimpl.

native/jni/Android.mk

...ve/jni/com_android_inputmethod_latin_BinaryDictionary.cpp

...olicyimpl/dictionary/bigram/bigram_list_reading_utils.cpp

.../policyimpl/dictionary/bigram/bigram_list_reading_utils.h

...onary/dictionary_structure_with_buffer_policy_factory.cpp

...cyimpl/dictionary/dynamic_patricia_trie_reading_utils.cpp

...licyimpl/dictionary/dynamic_patricia_trie_reading_utils.h

...est/policyimpl/dictionary/header/header_reading_utils.cpp

...est/policyimpl/dictionary/patricia_trie_reading_utils.cpp

...ggest/policyimpl/dictionary/patricia_trie_reading_utils.h

...icyimpl/dictionary/shortcut/shortcut_list_reading_utils.h

.../suggest/policyimpl/dictionary/utils/byte_array_utils.cpp

...rc/suggest/policyimpl/dictionary/utils/byte_array_utils.h

.../src/suggest/policyimpl/dictionary/utils/format_utils.cpp

...ni/src/suggest/policyimpl/dictionary/utils/format_utils.h