floss: Fix 'android-base/parseint.h' file not found

This fixes the breakage caused by https://r.android.com/3324693

Bug: 369703686
Bug: 360917504
Tag: #floss
Test: mmm packages/modules/Bluetooth
Test: USE=floss_upstream emerge-brya floss
Test: USE=floss_upstream emerge-rauru floss
Flag: EXEMPT, Floss-only change
Change-Id: I8ed5a2921b9075ce8fb7974a6eca3c9be1cdabe0