vmm: Add bzimage loader support

VMM may load different format kernel image to start guest, we currently
only have elf loader support, so add bzimage loader support in case
that VMM would like to load bzimage.

Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>

arch/src/lib.rs

@@ -15,6 +15,7 @@ extern crate libc;
 
 extern crate arch_gen;
 extern crate kvm_ioctls;
+extern crate linux_loader;
 extern crate vm_memory;
 
 use std::result;