Use ehci_setup() in ehci_ls1x_reset().

The Loongson1x SoCs have a built-in EHCI controller.
This patch adds the necessary glue code to make the generic EHCI
driver usable for them.
Signed-off-by: NKelvin Cheung <keguang.zhang@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>