lib/spd: Remove unused definition from bad backport

CL:3995566 and CL:3995574 add additional definition that is not used in
the factory branch when I resolve the conflict from backport.

BUG=b:221340733
TEST=compile only

Change-Id: I595342269d617c04aafc85c890340f9d26d45144
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/mosys/+/4049264
Tested-by: Bob Moragues <moragues@chromium.org>
Commit-Queue: Bob Moragues <moragues@chromium.org>
Reviewed-by: Bob Moragues <moragues@chromium.org>
Auto-Submit: Jian-Jia Su <jjsu@chromium.org>
1 file changed