ARM: dts: lpc18xx: Harmonize EHCI/OHCI DT nodes name

In accordance with the Generic EHCI/OHCI bindings the corresponding node
name is suppose to comply with the Generic USB HCD DT schema, which
requires the USB nodes to have the name acceptable by the regexp:
"^usb(@.*)?" . Make sure the "generic-ehci" and "generic-ohci"-compatible
nodes are correctly named.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Acked-by: Vladimir Zapolskiy <vz@mleia.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20220624141622.7149-3-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>