initramfs: Add ipmitool

Change-Id: I97b70e3e7a5282716c580aeac1f2c0bef1b744ab
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/initramfs-build.sh b/initramfs-build.sh
index 590d94c..43e9473 100755
--- a/initramfs-build.sh
+++ b/initramfs-build.sh
@@ -132,6 +132,7 @@
 BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
 BR2_TARGET_ROOTFS_CPIO=y
 BR2_TARGET_ROOTFS_CPIO_XZ=y
+BR2_PACKAGE_IPMITOOL=y
 # BR2_TARGET_ROOTFS_TAR is not set
 EOF_BUILDROOT