ARM: dts: fix DPLL4 x2 clkouts on 3630

OMAP3630 DPLL4 is different than on OMAP3430, in that it doesn't have
the x2 multiplier for its outputs. This is not currently reflected in
the clock DT data.

Fix the issue by setting the clock multiplier to 1 (instead of 2) for the
DPLL4 output clocks.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Tested-by: Christoph Fritz <chf.fritz@googlemail.com>
Tested-by: Marek Belisko <marek@goldelico.com>
Acked-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>