ARM: dts: omap3: Add clocks to McBSP nodes

Add clock properties to the McBSP nodes. McBSP2 and 3 need to have ick also
since the Sidetone block of these modules are operating using the McBSP
interface clock.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>