Update kickstarts to generate DNF repo config files

As the patching framework is updated to use DNF instead of the smart
package manager, the kickstarts are updated to generate the initial
DNF repo config files, rather than configure the smartpm channels.

Depends-On: https://review.opendev.org/700961
Change-Id: Ic625aa4646b45719c9527159aa46f157a4d2cff0
Story: 2006227
Task: 37935
Signed-off-by: Don Penney <don.penney@windriver.com>

bsp-files/kickstarts/post_common.cfg

@@ -31,25 +31,25 @@ else
 fi
 
 . /etc/platform/platform.conf
-# Configure smart package manager channels
-rm -rf /var/lib/smart
-mkdir /var/lib/smart
-/usr/bin/smart channel -y \
-    --add rpmdb type=rpm-sys name="RPM Database"
-/usr/bin/smart channel -y \
-    --add base type=rpm-md name="Base" baseurl=http://controller:${http_port:-8080}/feed/rel-xxxPLATFORM_RELEASExxx
-/usr/bin/smart channel -y \
-    --add updates type=rpm-md name="Patches" baseurl=http://controller:${http_port:-8080}/updates/rel-xxxPLATFORM_RELEASExxx
-
-# Configure smart to use rpm --nolinktos option
-/usr/bin/smart config --set rpm-nolinktos=true
-
-# Configure smart to use rpm --nosignature option
-/usr/bin/smart config --set rpm-check-signatures=false
 
 # Delete the CentOS yum repo files
 rm -f /etc/yum.repos.d/CentOS-*
 
+# Create platform yum repo file
+cat >/etc/yum.repos.d/platform.repo <<EOF
+[platform-base]
+name=platform-base
+baseurl=http://controller:${http_port:-8080}/feed/rel-xxxPLATFORM_RELEASExxx
+gpgcheck=0
+enabled=1
+
+[platform-updates]
+name=platform-updates
+baseurl=http://controller:${http_port:-8080}/updates/rel-xxxPLATFORM_RELEASExxx
+gpgcheck=0
+enabled=1
+EOF
+
 # Persist the boot device naming as UDEV rules so that if the network device
 # order changes post-install that we will still be able to DHCP from the
 # correct interface to reach the active controller.  For most nodes only the