defconfig: msm8916: Enable CC_STACKPROTECTOR

Enable the stack canary feature in an effort to detect
potential buffer overflows within the kernel.

CRs-Fixed: 526939
Change-Id: I4173ba81d2ad83d5cba0ff208b9d260a5ee21247
Signed-off-by: Kishan Kumar <kishank@codeaurora.org>