meta-phosphor: obmc-phosphor-image: set read-only-rootfs for static-norootfs feature

The static-norootfs is intended to be similar to the obmc-ubi-fs and
phosphor-mmc image layouts, in that all mounts are to be handled as
overlays.  Enable the `read-only-rootfs` DISTRO_FEATURE similarly.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I842689a62d49b7ce7431ea5572ff53286c0b374a
diff --git a/meta-phosphor/recipes-phosphor/images/obmc-phosphor-image.bb b/meta-phosphor/recipes-phosphor/images/obmc-phosphor-image.bb
index 0806ada..974b911 100644
--- a/meta-phosphor/recipes-phosphor/images/obmc-phosphor-image.bb
+++ b/meta-phosphor/recipes-phosphor/images/obmc-phosphor-image.bb
@@ -37,8 +37,9 @@
         obmc-system-mgmt \
         obmc-user-mgmt \
         obmc-user-mgmt-ldap \
-        ${@bb.utils.contains('DISTRO_FEATURES', 'obmc-ubi-fs', 'read-only-rootfs', '', d)} \
-        ${@bb.utils.contains('DISTRO_FEATURES', 'phosphor-mmc', 'read-only-rootfs', '', d)} \
+        ${@bb.utils.contains_any('DISTRO_FEATURES', \
+            'obmc-ubi-fs phosphor-mmc obmc-static-norootfs', \
+            'read-only-rootfs', '', d)} \
         ssh-server-dropbear \
         obmc-debug-collector \
         obmc-network-mgmt \