arm: mvebu: Call timer_init early before PHY and DDR init

Without calling timer_init(), the xdelay() functions return immediately.
We need to call timer_init() early, so that these functions work and
the PHY and DDR init code works correctly.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Anton Schubert <anton.schubert@gmx.de>
Cc: Luka Perkov <luka.perkov@sartura.hr>