Revert "[Product specifications] Add enterprise policy"

This reverts commit 259f96f21613a4bf0427b51b911884c08d8934e2.

Reason for revert: Policy format and name incorrect for feature

Original change's description:
> [Product specifications] Add enterprise policy
>
> This patch adds the declaration for the enterprise policy for product
> specifications. The policy is not checked anywhere yet, but is needed
> for network annotation definitions in subsequent patches.
>
> Bug: b:325109916
> Change-Id: If3191068904cbf22449183db63d463d1426be2d1
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5297236
> Commit-Queue: Matthew Jones <mdjones@chromium.org>
> Reviewed-by: Pavol Marko <pmarko@chromium.org>
> Reviewed-by: Sébastien Lalancette <seblalancette@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1265934}

BYPASS_POLICY_COMPATIBILITY_CHECK=Policy never launched in-code

Bug: b:325109916
Change-Id: I0e12808c00dc1804f212d5443f8356e556209032
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5405992
Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1282148}