ARM: orion5x: drop unused include from common.c

asm/times.h only defines CLOCK_TICK_RATE, cycles_t and get_cycles. All
three are not used in this file.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>