Inclusive Language Updates

master -> central
MASTER -> CENTRAL
Master -> Central

BYPASS_INCLUSIVE_LANGUAGE_REASON=required to explain the update

Bug: 170342881
Tag: #refactor
Test: cert/run --host
Test: atest --host bluetooth_test_common
Test: atest --host bluetooth_test_gd
Test: atest net_test_btif
Change-Id: I861ca756f04c06547ee9cb580029404308c678f2
Merged-In: I861ca756f04c06547ee9cb580029404308c678f2