arm/dts: Add support for TI AM3517/05 EVM board

Add AM3517 EVM (AM3517/05) DTS file to use the omap3.dtsi SoC file,
along with memory node and basic i2c information.

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>