board: ti: am571x: Add 666MHz support for AM571x IDK

AM571x supports DDR running at 666MHz. Right now it is
clocked at 532MHz which is lower than what is supported.
In order to have maximum performance on AM571-IDK,
switch DDR to 666MHz.

Signed-off-by: Steve Kipisz <s-kipisz2@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2 files changed