aconfig: fix build issue When trying to advance the CHECK_API flag, the build failed (so the CL couldn't submit) with an error that Build is not found. This happened because for the Flags template, I only gated the import statement on library_exported, not the SDK check itself. Fixed this and added a test to make sure SDK check is not added to Flags in internal codegen, even when the flag is on the finalized list. Also remove a build import from FeatureFlagsImpl where it was unused. Change-Id: I6474a67665169c9da1fc6325017eeaa9d5847048 Test: atest aconfig.test
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