Fix peci-pcie recipe to build in Yocto

A recent update to build outside of Yocto required the flag to
build in Yocto, so set the flag.

Tested:
Built in Yocto.

Change-Id: I4f2d7578c90864bc5c7554e90bd1efae59116b27
Signed-off-by: Jason M. Bills <jason.m.bills@linux.intel.com>
diff --git a/recipes-x86/peci-pcie/peci-pcie_git.bb b/recipes-x86/peci-pcie/peci-pcie_git.bb
index 638eea9..5dbe318 100644
--- a/recipes-x86/peci-pcie/peci-pcie_git.bb
+++ b/recipes-x86/peci-pcie/peci-pcie_git.bb
@@ -16,3 +16,5 @@
 S = "${WORKDIR}/git"
 
 SYSTEMD_SERVICE_${PN} += "xyz.openbmc_project.PCIe.service"
+
+EXTRA_OECMAKE = "-DYOCTO=1"