On 64bit BE, build fails with error "error: left shift count >= width of type"
casting the variable to uintptr_t which will set the size correctly.

R=predrag.rudic@imgtec.com, jkummerow@chromium.org, ivica.bogosavljevic@imgtec.com, hablich@chromium.org
LOG=N

Bug: 
Change-Id: I8e466bd2c17b9976171ffd88725dce548153108e
Reviewed-on: https://chromium-review.googlesource.com/616010Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Jaideep Bajwa <bjaideep@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#47362}