scripts: Update the gcc-wrapper white list for 4.12.rc6 release

Update the white list of warnings for the latest kernel
release 4.12.rc6, which are being treated as errors while
compiling Kernel with clang compiler.

Change-Id: I0f7c47ac05f62c5c4dfce65afb78db349a9b651c
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>