msm/sde: Fix compile warnings

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

 drivers/gpu/drm/msm/sde/sde_kms.c:3357:
   format '%d' expects argument of type 'int', but argument 4 has type 'long int' [-Werror=format=]
   SDE_ERROR("failed to init sid %d\n", PTR_ERR(sde_kms->hw_sid));

Fixes: 1fa7a093 ("msm/sde: add SID register support for offline rotator")
Change-Id: Ic0dedbad14ffee21d92c8b3558a2effa4c0926c1
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>