Clocksource read callback expects incrementing timer values, while
internal timer on Marvell SoCs counts backwards. Fix value returned
by Marvell MVEBU and Orion clocksource drivers.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>