Floss: Fix cpplint errors

Fix below cpplint errors
- Use int16/int64/etc, rather than the C type short
- Using C-style cast
- include used libs
- remove redundant ; after }
- ignore unapproved C++11 header
- add username to TODO

Bug: 357792559
Tag: #floss
Test: mmm packages/modules/Bluetooth
Test: build
Flag: EXEMPT, Floss-only changes
Change-Id: I26a1b49325ba0500d18310cd1a68d0e5f94fb78f