crypto/internal/fips/aes: add service indicators

crypto/internal/fips/aes: add service indicators

For #69536

Change-Id: I485c165b1d9fcd7b09ff151bbeebc57d8908bcb8
Reviewed-on: https://go-review.googlesource.com/c/go/+/626835
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Daniel McCarney <daniel@binaryparadox.net>