ARM: at91/dt: sam9261: Fix PLL output ranges and other clocks divisors

Argument 3 (OUT) and 4 (ICPLL) of the atmel,pll-clk-output-ranges were missing.
Also, the at91sam9261 doesn't really have a by 3 divisor.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>