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/witherspoon-tacoma.conf b/meta-ibm/conf/machine/witherspoon-tacoma.conf
index 6948853..8d2a907 100644
--- a/meta-ibm/conf/machine/witherspoon-tacoma.conf
+++ b/meta-ibm/conf/machine/witherspoon-tacoma.conf
@@ -12,6 +12,7 @@
 require conf/machine/include/p9.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"