[sdk] Changes to libsparse to build using uefi toolchain.

Add missing includes and tweak dependencies to libsparse targets when
building using the kernel.efi toolchain.

Change-Id: Idfcc773984f6cb5b87d0ace1ec5a42562e076d00
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/vboot_reference/+/851176
Reviewed-by: Yecheng Zhao <zyecheng@google.com>