Revert "sanitycheck: reduce number of unnecessary configuration builds"

This reverts commit 4e2cf33d.

The change does not work correct if we have a filter and specify a
specific platform, such as:

./scripts/sanitycheck -p 96b_nitrogen -i -s samples/hello_world/test_singlethread

Change-Id: I43a4f25ed25c8fe5379cda23b6dbfa8f9ae5cb0d
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>