arm/dts: omap3-evm: Add i2c and twl4030 support

Add support for TWL4030, which is interfaced on i2c1 bus.
Also add clock frequencies for other i2c instances (2 & 3)
required for client-device exist on OMAP3EVM board.

Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Tony Lindgren <tony@atomide.com>