x/build: android and iOS corellium builders are missing

[cherrymui]

The android-arm-corellium and android-arm64-corellium builders seem missing, along with the ios-arm64-corellium builder (#48772 may be related for the latter).

host-android-arm64-corellium-android: 0/0 (3 missing)
host-ios-arm64-corellium-ios: 0/0 (3 missing)

cc @golang/release

[toothrot]

These builders are owned by @znly.

We may have to consider removing them, as they've been missing for some months.

[gopherbot]

Change https://golang.org/cl/357550 mentions this issue: dashboard: add KnownIssue to corellium builders

[dmitshur]

CC @steeve as a point of contact in the builder's README.

Also CC @changkun who has been contributing on iOS side, in case you're interested and able to help with the occasional restarts that the builders need.

[steeve]

Let me look into that. You were right in mentioning me.
Adding @eliasnaur as well.

[steeve]

I have restarted the builders on Corellium, indeed they were offline.

[gopherbot]

Change https://golang.org/cl/363985 mentions this issue: dashboard: remove known issue for iOS and Android builders