[ARM] 5617/1: rename this spi device as w90p910-spi

When programming clock api, I named this spi device
as w90p910-usi, now, I think named it as w90p910-spi better

Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>