floss: Rename DelayedActions to AdapterActions

This enum was first introduced for some actions that were really
"delayed", but now they no longer exist. This patterns is now widely
used in the project so let's follow the common naming.

Bug: None
Tag: #floss
Test: mmm packages/modules/Bluetooth
Flag: EXEMPT, Floss-only change
Change-Id: I00b6fa2e506c7754566e0c6e97678fdd75913ef3