ARM: shmobile: armadillo800eva: set clock rates before timer init

Previously clock rates were set after initialization of timer.
Therefore the timer used the default extal1 clock rate (25MHz)
instead of the correct rate for this board (24MHz).

Signed-off-by: Hideki EIRAKU <hdk@igel.co.jp>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>