mpreboot: add to rainier and tacoma systems

Both rainier and witherspoon-tacoma systems support the mpreboot
feature.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: Ieeb4724a5cf5678ba0f6ab950b5403db5aebcd88
diff --git a/meta-ibm/conf/machine/rainier.conf b/meta-ibm/conf/machine/rainier.conf
index 9c1a7a4..f5152f7 100644
--- a/meta-ibm/conf/machine/rainier.conf
+++ b/meta-ibm/conf/machine/rainier.conf
@@ -11,6 +11,7 @@
 include conf/machine/include/ibm-power10-cpu.inc
 require conf/distro/include/openpower-virtual-pnor.inc
 require conf/distro/include/phosphor-mmc.inc
+require conf/distro/include/ibm-mpreboot.inc
 
 SERIAL_CONSOLES = "115200;ttyS4"