Added function to differentiate between the OMAP3EVM revisions. The
chip-id of the ethernet PHY is being used for this purpose.

Rev A to D : 0x01150000
Rev >= E   : 0x92200000
Signed-off-by: NVaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: NAjay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: NSanjeev Premi <premi@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>