Add KeyChain.createManageCredentialsIntent

Missed from previous cherry-pick.

Test: make -j docs
Bug: 179180345
Merged-In: I1e57ed9c18a1ada463c55dbf17ce30e31aa7bad2
Change-Id: I1d88e11740a13490613962c944b528e6c2bd0fcb
3 files changed