meta-ibm: p10bmc: add a MCTP DISTRO_FEATURES switch

The switch enables AF_MCTP and adds the `mctp` tool and `mctpd` so we
can setup and manage an in-kernel MCTP network.

Enable it for p10bmc and also add CONFIG_TUN so we can use a tun device
to transport packets between the kernel and the astlpc interface
implemented in libmctp.

Change-Id: I21d0af9e751f91975c760b4b4708b3b401b95417
Signed-off-by: Rashmica Gupta <rashmica@linux.ibm.com>
diff --git a/meta-ibm/conf/machine/p10bmc.conf b/meta-ibm/conf/machine/p10bmc.conf
index 4f23ec6..e42ec22 100644
--- a/meta-ibm/conf/machine/p10bmc.conf
+++ b/meta-ibm/conf/machine/p10bmc.conf
@@ -21,7 +21,7 @@
 require conf/distro/include/ibm-mpreboot.inc
 require conf/distro/include/ibm-yaml.inc
 include conf/distro/include/extra-dev-debug-tools.inc
-DISTRO_FEATURES += "ibm-service-account-policy"
+DISTRO_FEATURES += "ibm-service-account-policy mctp"
 MACHINE_FEATURES += 'phal tpm2'
 
 SERIAL_CONSOLES = "115200;ttyS4"