Update aidl_interface.go for ModuleSrcPath changes

Replace WithSubDir with PathWithModuleSrcSubDir.

Don't use Join on the result of PathForModuleSrc, it is changing
to return a Path which does not have Join.

Test: m checkbuild
Change-Id: Id091028838de0af5f791935074cca00b79d20c5a
1 file changed