Inclusive Language Updates

slave -> peripheral
SLAVE -> PERIPHERAL
Slave -> Peripheral

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: I4a3cccc0c1d182f172a21a6c70d569e5a89a5916
Merged-In: I4a3cccc0c1d182f172a21a6c70d569e5a89a5916