scripts: Clean up the gcc-wrapper white list

Update the white list of warnings for the latest
kernel release based on current CFLAG settings.
Disabled undefined-optimized and tautological features,
so clean up the gcc-wrapper list based on current settings.

Change-Id: If6a733c35b4b09b2357ced7997fb2ff16204c766
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>