Remove hdmasterkeyid

Summary:
Deprecated return results that were scheduled to be removed in v0.21

Partial backport of Core PR14021
https://github.com/bitcoin/bitcoin/pull/14021/commits/345bff6013e0d1a7eb0a08a071723b27f0460b77

Test Plan:

ninja
ninja check-functional

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, deadalnix

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, deadalnix

Subscribers: deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D5933