Android 11.0.0 release 30
Cherry-pick: ICU-20956 Fix monetary symbol getters in DecimalFormat

Cherry-pick of 2 commits from aosp/master:
1. https://r.android.com/1398733
2. https://r.android.com/1402648

Upstream commit:
https://github.com/unicode-org/icu/commit/1e24bcd7211d3c020801ffbaac7efa7b5e1b7e21

It's a partial cherry-pick excluding the ICU4C change. Without the ICU4C
part, it's a straight cherry-pick without merge conflict.

Bug: 158720136
Bug: 162744366
Test: atest CtsLibcoreTestCases
Test: atest CtsIcuTestCases
Change-Id: I767dd59c7a3bdbc73f313125b05d273a454532e2
10 files changed