usb: host: ehci-spear: Remove redundant use of of_match_ptr

'spear_ehci_id_table' is always compiled in. Hence use of
of_match_ptr is unnecessary.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>