openpower-software-manager: Disable building tests

We don't yet support turning on ptest so we are wasting cycles building
them.

Change-Id: I1820fb8299aa2fc3ff0e7820aaea1dd8ea37dc86
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-openpower/recipes-phosphor/flash/openpower-software-manager_git.bb b/meta-openpower/recipes-phosphor/flash/openpower-software-manager_git.bb
index da237d7..8cd5097 100644
--- a/meta-openpower/recipes-phosphor/flash/openpower-software-manager_git.bb
+++ b/meta-openpower/recipes-phosphor/flash/openpower-software-manager_git.bb
@@ -37,6 +37,7 @@
 PACKAGECONFIG[virtual_pnor] = "-Dvpnor=enabled, -Dvpnor=disabled"
 
 EXTRA_OEMESON += " \
+    -Dtests=disabled \
     -Dmsl="v2.0.10 v2.2" \
     "