Add support for TI's AM437x StarterKit Evaluation
Module.

Cc: Josh Elliot <jelliott@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>
Tested-by: NFranklin Cooper Jr. <fcooper@ti.com>
Tested-by: NTom Rini <trini@ti.com>
Tested-by: NDarren Etheridge <detheridge@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>