usb: isp1760: fix memory pool initialization

usb: isp1760: fix memory pool initialization

The loops to setup the memory pool were skipping some
blocks, that was not visible on the ISP1763 because it has
fewer blocks than the ISP1761. But won testing on that IP
from the family that would be an issue.

Reported-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Link: https://lore.kernel.org/r/20210827131154.4151862-2-rui.silva@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>