Revert^2 "Upgrade zerocopy to 0.7.5"

893738e5702b1f065826d9a31cef2122a502da66

Change-Id: Ib91e64e7a32e6b31fa0bde93dbfc411c60d33301
diff --git a/virtualizationservice/vfio_handler/src/aidl.rs b/virtualizationservice/vfio_handler/src/aidl.rs
index 1c3c5d9..618c165 100644
--- a/virtualizationservice/vfio_handler/src/aidl.rs
+++ b/virtualizationservice/vfio_handler/src/aidl.rs
@@ -26,6 +26,7 @@
 use rustutils::system_properties;
 use zerocopy::{
     byteorder::{BigEndian, U32},
+    FromZeroes,
     FromBytes,
 };
 
@@ -82,7 +83,7 @@
 /// The structure of DT table header in dtbo.img.
 /// https://source.android.com/docs/core/architecture/dto/partitions
 #[repr(C)]
-#[derive(Debug, FromBytes)]
+#[derive(Debug, FromZeroes, FromBytes)]
 struct DtTableHeader {
     /// DT_TABLE_MAGIC
     magic: U32<BigEndian>,
@@ -106,7 +107,7 @@
 /// The structure of each DT table entry (v0) in dtbo.img.
 /// https://source.android.com/docs/core/architecture/dto/partitions
 #[repr(C)]
-#[derive(Debug, FromBytes)]
+#[derive(Debug, FromZeroes, FromBytes)]
 struct DtTableEntry {
     /// size of each DT
     dt_size: U32<BigEndian>,