purge linux/slab.h usage

Replace the kernel memory alloc funcs with the standard C library ones.

BUG=chromium:878440
TEST=build works

Change-Id: I1214b6ba6b5fe0013d789e9d12bc5b9ca80cc5b5
Reviewed-on: https://chromium-review.googlesource.com/1194721
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
3 files changed