ARM: at91/dt: define main xtal frequency of the at91sam9261ek board

Define at91sam9261ek main crystal frequency.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Jean-Jacques HIBLOT <jjhiblot@traphandler.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
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