OMAP4 has two different Devices IVA and DSP. DSP is bound
with IVA for DVFS. The registration of IVA dev in API
'omap2_init_processor_devices' was missing. Init dev for
'iva_dev' is added.

This also fixes the following error seen during boot as
omap2_set_init_voltage can now find the iva device

	omap2_set_init_voltage: Invalid parameters!
	omap2_set_init_voltage: Unable to put vdd_iva to its init voltage
Signed-off-by: Shweta Gulati <shweta.gulati@ti.com>
Acked-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>