The only case for this was Blueprint itself at build/blueprint, but with
that being a part of Soong, this special case is not necessary anymore.
Test: Presubmits.
Change-Id: Icc51cd80bd43f936a97018061cfbf76fc385e4c3
Using a gomod-aware editor with build/soong requires that files
in build/soong can be mapped to the android/soong package path.
Move the partner androidmk and bpfix files such that their path
matches the package path when the android/soong package prefix is
replaced with the build/soong path prefix.
Test: go test ./...
Test: m bpfix androidmk partner_bpfix partner_androidmk
Change-Id: Ic7f7aad9e5eb9178eef0383f0b37e4fb93ce8314