Move to Kotlin requireNotNull() from Preconditions.checkNotNull()

Replace last usage of Preconditions.checkNotNull() in Permission code.

We are in Kotlin so the Kotlin way can be preferred.

Somehow the JSpecify @NonNull from Preconditions.checkNotNull()
isn't being recognized as non-null by the Kotlin compiler used for
the code here and that's blocking AndroidX prebuilt drop, so let's
get out of the way for that first, while improving our code a tiny
bit.

Bug: 385912424
Flag: EXEMPT bugfix
Relnote: N/A
Test: build
Merged-In: I42504a24a8544b56dbbbf5e0cd707355304717de
Merged-In: Ie7a14d7d4ea5384d8ffc427bd6e9a65f8e6071b2
Change-Id: Ie7a14d7d4ea5384d8ffc427bd6e9a65f8e6071b2
3 files changed