Enable power on EHCI root hub ports only if the controller supports it.
Wait 20ms for the power to become stable.
Change-Id: I8897756ed2bfcb88408fe5e9f9e3f8af5dd900ac
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: http://review.coreboot.org/1078
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>