intel_gspi: Remove DIV_ROUND_UP() redefinition

DIV_ROUND_UP() is now defined in libpayload.

CQ-DEPEND=CL:1558104
BRANCH=None
BUG=None
TEST=None

Change-Id: I7ebda156aa50bdbd585686eba6a70666abd55bf3
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1558131
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-by: Patrick Georgi <pgeorgi@chromium.org>
1 file changed