spi: sh-msiof: Fix warnings due to improper casts

Cast pointers to uintptr_t instead of unsigned int. This fixes warnings
on platforms where pointers have a different size than int.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --cc drivers/spi/spi-sh-msiof.c
Simple merge