repack: move sbin to /system ramdisk and update repacking
for android-10

This will support updating the ramdisk to a different
compression format and co-exist with magisk.

We are also cleaning up and removing non android-10
api makefile actions.

We are also moving twrp repacking to its own class. We
check the new ramdisk format and if it's different
we have magisk compress using the new ramdisk format.

Change-Id: I770030aae7797e75817178b2f0fccd9f39dc23af
diff --git a/crypto/fscrypt/FsCrypt.cpp b/crypto/fscrypt/FsCrypt.cpp
index 397f131..5d68fce 100755
--- a/crypto/fscrypt/FsCrypt.cpp
+++ b/crypto/fscrypt/FsCrypt.cpp
@@ -89,7 +89,7 @@
 
 const std::string user_key_dir = std::string() + DATA_MNT_POINT + "/misc/vold/user_keys";
 const std::string user_key_temp = user_key_dir + "/temp";
-const std::string prepare_subdirs_path = "/sbin/vold_prepare_subdirs";
+const std::string prepare_subdirs_path = "/system/bin/vold_prepare_subdirs";
 
 const std::string systemwide_volume_key_dir =
     std::string() + DATA_MNT_POINT + "/misc/vold/volume_keys";