LAKITU: Allow unprefixed pkg-config in lakitu kernels

Kernel makefiles use the `pkg-config` command to use the host
pkg-config. To avoid carrying a kernel patch that uses a pkg-config
variable, let's allow unprefixed pkg-config in lakitu kernels.

BUG=b/257271340
TEST=presubmit
RELEASE_NOTE=None

Change-Id: Ibec682168245cccfa05f841c374a2e833d0359ad
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/chromiumos-overlay/+/41078
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Vaibhav Rustagi <vaibhavrustagi@google.com>
1 file changed