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.

(From meta-phosphor rev: 68fa8006229cb60900e4880e655bda8b67515ea0)

Change-Id: I5f5afaf7414855d7cfebe2f610e16b34d0ba5694
Signed-off-by: Jason M. Bills <jason.m.bills@linux.intel.com>
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-phosphor/recipes-x86/peci-pcie/peci-pcie_git.bb b/meta-phosphor/recipes-x86/peci-pcie/peci-pcie_git.bb
index 638eea9..5dbe318 100644
--- a/meta-phosphor/recipes-x86/peci-pcie/peci-pcie_git.bb
+++ b/meta-phosphor/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"