meta-phosphor: enable DISTRO_FEATURE 'security'

The meta-security layer requires the DISTRO_FEATURE 'security' set
otherwise it gives a warning:

    WARNING: You have included the meta-security layer, but 'security'
    has not been enabled in your DISTRO_FEATURES. Some bbappend files
    and preferred version setting may not take effect. See the
    meta-security README for details on enabling security support.

This DISTRO_FEATURE doesn't really seem to do anything except enable
an additional include file in the linux-yocto recipe (which itself
then checks other features).  It seems entirely safe for us to enable
this feature everywhere to avoid the warning.

    $ git grep -A4 "DISTRO_FEATURES" | grep "'security'"
    meta-security/README:to have 'security' in DISTRO_FEATURES to have effect.
    meta-security/README:    'security' has not been enabled in your DISTRO_FEATURES. Some bbappend files
    meta-security/classes/sanity-meta-security.bbclass:    if 'security' not in e.data.getVar('DISTRO_FEATURES').split() and not skip_check:
    meta-security/classes/sanity-meta-security.bbclass:'security' has not been enabled in your DISTRO_FEATURES. Some bbappend files \
    meta-security/recipes-kernel/linux/linux-yocto_5.%.bbappend:require ${@bb.utils.contains('DISTRO_FEATURES', 'security', '${BPN}_security.inc', '', d)}

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ife1549783b356f87f429466f260f34b9a41d002c
diff --git a/meta-phosphor/conf/distro/include/phosphor-base.inc b/meta-phosphor/conf/distro/include/phosphor-base.inc
index dba3fe4..8c5e4fc 100644
--- a/meta-phosphor/conf/distro/include/phosphor-base.inc
+++ b/meta-phosphor/conf/distro/include/phosphor-base.inc
@@ -99,6 +99,7 @@
         ipv4 \
         ipv6 \
         pam \
+        security \
         slp \
         systemd \
         "