AOSP10 TWRP Merge: fix conflicts and update libraries needed

This allows flame to boot TWRP. Still will need to work on
super partition for vendor and system access.

The plan will be to cherry-pick any updates to android-9.0
through gerrit.twrp.me to this branch as a WIP.
diff --git a/adbbu/Android.mk b/adbbu/Android.mk
index 8f8dbd0..e271938 100644
--- a/adbbu/Android.mk
+++ b/adbbu/Android.mk
@@ -41,7 +41,7 @@
 LOCAL_CFLAGS:= -c -W
 LOCAL_MODULE:= twrpbu
 LOCAL_MODULE_STEM := bu
-LOCAL_MODULE_TAGS:= eng
+LOCAL_MODULE_TAGS:= optional
 LOCAL_MODULE_CLASS := RECOVERY_EXECUTABLES
 LOCAL_MODULE_PATH := $(TARGET_RECOVERY_ROOT_OUT)/sbin
 include $(BUILD_EXECUTABLE)