scripts: Update the gcc-wrapper white list for 4.12.rc7 release

Update the white list of warnings for the latest kernel
release 4.12.rc7, which are being treated as errors while
compiling Kernel with clang compiler.

Change-Id: I0c04a7d550e9c2dad3f5b577eeff76607651c5b0
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>