block: Remove vhdx compat alias

Re-export Vhdx from formats::vhdx and update the fuzz target to
use block::formats::vhdx::Vhdx. Remove the vhdx compat alias
from lib.rs.

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>

block/src/lib.rs

@@ -28,7 +28,6 @@ use std::str::FromStr;
 use std::{cmp, mem, result};
 
 use formats::qcow::internal as qcow;
-pub use formats::vhdx::internal as vhdx;
 #[cfg(feature = "io_uring")]
 use io_uring::{IoUring, Probe, opcode};
 use libc::{