scripts: Update the gcc-wrapper white list for 4.12.rc3 release

Update the white list of warnings for the latest kernel
release 4.12.rc3, which are being treated as errors while
compiling Kernel with clang compiler.

Change-Id: I3887cf147a8f2ad7e6b2c5ad9e3e1a5b174ff932
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>