Revert "Use bfd as the linker to build vboot_reference."
Revert "Use bfd as the linker to build vboot_reference."

This reverts commit 4856877a76a90ab1851c0e24593ec67e6375a60a.

Reason for revert: Root cause fixed by CL:1790955.

Original change's description:
> Use bfd as the linker to build vboot_reference.
>
> Coreboot uses vboot_reference to build futility as a host binary.
> However, it passes a target path for linking which causes LLD to
> error out.
> e.g. x86_64-pc-linux-clang -L/build/veyron_minnie/usr/lib
> where -L/build/veyron_minnie/usr/lib should not be passed
> as futility is being linked as a host binary.
>
> Use bfd as the linker temporarily as it only produces a warning
> and does not error out.
>
> BUG=chromium:999217
> TEST=coreboot builds
> BRANCH=None
>
> Change-Id: I8716ff3a0b4cc8afc54a3cc95ca5c1bfdcba6c9f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1789676
> Tested-by: Manoj Gupta <1d49d0f302d724a1dc5fc4d717d15418e9808ddd@chromium.org>
> Reviewed-by: Julius Werner <4d12f06cff3725783b352157673a720bc67c4afe@chromium.org>
> Commit-Queue: Manoj Gupta <1d49d0f302d724a1dc5fc4d717d15418e9808ddd@chromium.org>

Bug: chromium:999217
Change-Id: Ibf69ca06e3ae2e681176499b23c673eda8d77b6c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1790956
Tested-by: Manoj Gupta <1d49d0f302d724a1dc5fc4d717d15418e9808ddd@chromium.org>
Reviewed-by: Julius Werner <4d12f06cff3725783b352157673a720bc67c4afe@chromium.org>
Commit-Queue: Manoj Gupta <1d49d0f302d724a1dc5fc4d717d15418e9808ddd@chromium.org>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot