Revert "scripts: gcc-wrapper: Add sched warnings to white list"

This reverts commit 5dccd916.
Now that these warnings are fixed, remove them from white list.

Change-Id: Ieee921499f55ed2cf80bcacdac3d9965b2aa0c40
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>