common/util: Remove __stdlib_compat from functions not in C standard library
common/util: Remove __stdlib_compat from functions not in C standard library

These functions are not in the C standard library, so they should not be
annotated with __stdlib_compat.

BRANCH=none
BUG=b:234181908, b:172020503
TEST=./util/compare_build.sh -b all -j 120
     => MATCH

Signed-off-by: Tom Hughes <fc5c12f30a5ed2baa0581f44ee14ad1eb7b20d83@chromium.org>
Change-Id: Iccc532764056dd22f93ffea170f2d7e422d1b6dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3724166
Reviewed-by: Eric Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@google.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec