scripts: Update the gcc-wrapper white list for 4.14-rc1 release

Update the white list of warnings for the latest kernel release
4.14-rc1, which are being treated as errors while compiling kernel
with clang compiler.

Change-Id: Ib2e57499c2483b33d22f3bcbf877c334ec0118e5
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>