usb: host: ehci-platform: add TPL support

usb: host: ehci-platform: add TPL support

The Target Peripheral List (TPL) is used to identify targeted devices
during Embedded Host compliance testing. The user can add "tpl-support"
in the device tree to enable it.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20220621152350.145745-3-fabrice.gasnier@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>