Merge recent doc changes for OEMCrypto

This is a cherry pick of recent changes to OEMCrypto and ODK. Most of
these are part of the document migration to doxygen.

See http://go/wvgerrit/106005 and its parents for code reviews.

Bug: 144715340
Bug: 148232693
Bug: 167580674
Change-Id: I658f99c8117b974faed97322d61fac0f382283af

libwvdrmengine/oemcrypto/test/common.mk

@@ -13,6 +13,7 @@ LOCAL_SRC_FILES:= \
   oec_decrypt_fallback_chain.cpp \
   oec_key_deriver.cpp \
   oec_session_util.cpp \
+  oemcrypto_corpus_generator_helper.cpp \
   oemcrypto_session_tests_helper.cpp \
   oemcrypto_test.cpp \
   oemcrypto_test_android.cpp \
@@ -21,6 +22,7 @@ LOCAL_SRC_FILES:= \
   ../../cdm/util/test/test_sleep.cpp \
 
 LOCAL_C_INCLUDES += \
+  $(LOCAL_PATH)/fuzz_tests \
   $(LOCAL_PATH)/../include \
   $(LOCAL_PATH)/../odk/include \
   $(LOCAL_PATH)/../odk/kdo/include \