spi-geni-qcom: Fix compile warnings

Fix the following compiler warning(s) from gcc 6.1.1 with -Werror enabled:

 drivers/spi/spi-geni-qcom.c:191:
   format '%u' expects argument of type 'unsigned int', but argument 6 has
     type 'long unsigned int' [-Werror=format=]
  dev_dbg(mas->dev, "%s: req %u resultant %u sclk %lu, idx %d, div %d\n",

Fixes: 4652e364 ("spi-geni-qcom: Add SPI GENI driver snapshot")
Change-Id: Ic0dedbad5db93f59c3d2f91d7b99cd7cbf9471e4
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>