uboot-phytec

HACK: configs: k2l/e/hk: disable USB support

USB support in U-Boot for K2L/K2E/K2HK is broken after
commit 4dd76d0f96ab ("usb: host: replace xhci-keystone
driver by the generic dwc3 driver")

Now PHY programming does not happen at all because
dwc3_setup_phy() looks for 'phys' property in DT which
does not exist. There is also sequence between PHY
configuration and PSC enable in old code which seems
to be necessary for USB to function correctly.

Worse, just enabling USB PSC in board_init() causes
USB in kernel to fail booting. This needs to be debugged.

For now, disable USB in U-Boot to make kernel on these
devices usable. Having USB enabled in U-Boot does not
serve much purpose anyway.

Tested on K2E, K2HK, K2L EVM to boot kernel successfully.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>