Revert "Disable XOM in init."

This reverts commit 055347e5.

Reason for revert:
init boots with XOM now. I think this was fixed when this boringssl patch got merged in earlier this week (init has a static dependency on libcrypto):
https://boringssl-review.googlesource.com/c/boringssl/+/33245

Change-Id: I70e15fad4a194c0d2087941bba70dfcd38abe8b5