plat/palmetto: Initialise BT/IPMI interface on Palmetto
plat/palmetto: Initialise BT/IPMI interface on Palmetto

This patch adds a device tree entry for the BT interface on Palmetto
and a call to initialise the BT/IPMI driver to allow interaction with
the BMC via IPMI commands.

[ Minor changes to device-tree representation -- BenH ]

Signed-off-by: Alistair Popple <e9adbcf81c8a36ccc628e09bc92d0e25e1c8e501@popple.id.au>
Signed-off-by: Benjamin Herrenschmidt <a7089bb6e7e92505d88aaff006cbdd60cc9120b6@kernel.crashing.org>

ddstreet/skiboot,shenki/skiboot,neelegup/skiboot,open-power/skiboot,csmart/skiboot,csmart/skiboot,apopple/skiboot,ddstreet/skiboot,apopple/skiboot,stewart-ibm/skiboot,jk-ozlabs/skiboot,legoater/skiboot,open-power/skiboot,legoater/skiboot,cyrilbur-ibm/skiboot,cyrilbur-ibm/skiboot,stewart-ibm/skiboot,qemu/skiboot,mikey/skiboot,shenki/skiboot,mikey/skiboot,stewart-ibm/skiboot,neelegup/skiboot,open-power/skiboot,qemu/skiboot,csmart/skiboot,open-power/skiboot,shenki/skiboot,shenki/skiboot,shenki/skiboot,legoater/skiboot,neelegup/skiboot,qemu/skiboot,legoater/skiboot,mikey/skiboot,qemu/skiboot,ddstreet/skiboot,jk-ozlabs/skiboot,legoater/skiboot,jk-ozlabs/skiboot,cyrilbur-ibm/skiboot,apopple/skiboot,open-power/skiboot,qemu/skiboot