Revert "am335x_evm: Add check for non-0 profile on GP EVM, update fdtfile"

On further review, this change isn't helpful as our test environment
will likely blow away this information as part of ensuring an otherwise
known development environment, so just let them load the correct device
tree as needed.

This reverts commit bf9a9b6889de11b1fdea72ac5c0515653a25dc66.

Signed-off-by: Tom Rini <trini@ti.com>
ARM: fdt support: Add usbethaddr as an acceptable MAC

A board that has a USB ethernet device only may set the usbetheraddr
and not the ethaddr.
ethaddr will be the default MAC address that is chosen and if that
is not populated then the usbethaddr is looked at.  If neither are set
then then device tree blob is not modified.

Signed-off-by: Dan Murphy <dmurphy@ti.com>