arm: baltos: enable mPCIe slot and configure external GPIO controller
Baltos devices provide a mPCIe slot, whose power is turned off by
default. This patch activates mPCIe slot in barebox, so that for example
GSM modem can be already available in user space.
Also configure external GPIO controller via setting its output pins to
low.
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>