Tweak framework-mime / mimemap dependencies.

This CL addresses an outstanding review comment from
https://r.android.com/1115772 . To be honest, I don't
fully get the semantics of what I've changed, so I've
followed Jiyong's suggestions pretty blindly, except
that I've added the static dependency on mimemap to
framework-minus-apex as opposed to the (non-existing)
frameworks.

Test: Confirmed that the data files are still in framework.jar by
      rebuilding (make installclean && make droid && flashall )
      and then running:
      adb shell su 0 unzip -l /system/framework/framework.jar | grep types
Test: atest CtsMimeMapTestCases
Change-Id: Icfa5aba8455c7460063d1e4812c71c5a2c0c6c90