Revert: "cmd/link: add option to enable full RELRO for ELF"

Revert: "cmd/link: add option to enable full RELRO for ELF"

This reverts https://go.dev/cl/c/go/+/473495.

Reason for revert: breaks some Google-internal tests.

This revert will be temporary until we can gather more info on the
nature of the failures and hopefully develop an upstream test case,
etc.

Updates #45681.

Change-Id: Ib628ddc53bc5489e4f76c0f4ad809b75e899102c
Reviewed-on: https://go-review.googlesource.com/c/go/+/571415
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>