platform: msm_shared: Avoid the integer overflow in qseecom

Avoid the possible integer overflow in rounding up the keymaster partition
size.

Issue: SEC-1603
Change-Id: I0e119881723931b0913b6a185b80008b2bb0d17f
(cherry picked from commit abe4f7042cbdef928ffc152335a17150fb39b096)
1 file changed