Follow Soong changes to PathForSource behavior in tests

Soong no longer enforces that files referenced with PathForSource
or PathForModuleSrc exist in the mock filesystem.  Remove unnecessary
files from the AIDL tests, and manually throw an error for the API
files since the test wants to assert they don't exist.

Bug: 153485543
Test: aidl_test.go
Change-Id: I59018e2d69257ac6ce7d2c0b5e3e3fc5f18702fb
Merged-In: I59018e2d69257ac6ce7d2c0b5e3e3fc5f18702fb
(cherry picked from commit 1976ae24f4d2f491f213f1653b25423fc9253ce4)
2 files changed