Floss: Implement APIs in topshim profiles to make them togglable

Implements the following APIs for topshim profiles
- enable
- disable
- is_enabled

The original logic of |initialize| is splitted into setting the
dispachers and enabling the internal interface. The new |initialize|
do the former part and |enable| do the latter part.

Bug: 239434117
Test: test along with the top of this chain
Tag: #floss

Change-Id: Ie604d38fb7e961c2b2c86817336db6f6e78c0069