Clarify code in EnforcePermissionDetector by renaming parameters

`anno1` -> `overridingAnnotation`,
`attr1` -> `overridingAttributes`,
`anno2` -> `overriddenAnnotation`,
`attr2` -> `overriddenAttributes`,

Bug: 260314719
Test: atest --host AndroidGlobalLintCheckerTest
Test: atest --host AndroidGlobalLintCheckerIntegrationTest
Flag: EXEMPT rename variable no-op
Change-Id: Ic14c7984ae6aa5db376aec60646e1e840291448e