phosphor-gpio-monitor: Disable building tests

We don't yet use ptest so we are wasting cycles building tests

Change-Id: If4286da34d5d1f1b2e029f80fa3da00d36fc9dec
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-phosphor/recipes-phosphor/gpio/phosphor-gpio-monitor_git.bb b/meta-phosphor/recipes-phosphor/gpio/phosphor-gpio-monitor_git.bb
index 5220431..37908e0 100644
--- a/meta-phosphor/recipes-phosphor/gpio/phosphor-gpio-monitor_git.bb
+++ b/meta-phosphor/recipes-phosphor/gpio/phosphor-gpio-monitor_git.bb
@@ -46,3 +46,5 @@
 SRC_URI += "git://github.com/openbmc/phosphor-gpio-monitor"
 SRCREV = "b08a0f691740ef21e28547a57981b1043d46d8ce"
 S = "${WORKDIR}/git"
+
+EXTRA_OEMESON += "-Dtests=disabled"