Simplify the exported FindKernelConfig() function.

FindKernelConfig() is used to extract the kernel cmdline from a kernel
partition. It's only used in the chromeos-installer, but was a bit awkward.
This changes the calling parameters to make it simpler.

BUG=chromium:221544
BRANCH=none
TEST=manual
CQ-DEPEND=CL:46835

  FEATURES=test sudo emerge vboot_reference
  FEATURES=test emerge-$BOARD vboot_reference

Change-Id: Ib7192175d72ad51387d8d122ead4490a4aa62300
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/46834
3 files changed