defconfig: arm64: Enable HARDENED_USERCOPY_PAGESPAN for smd855

Enable config HARDENED_USERCOPY_PAGESPAN flag so that, hardened
usercopy will reject attempts to copy on multi-page allocation
with __GFP_COMP flags. This flag is part of HARDENED_USERCOPY feature.

Change-Id: Ibbcde5d237328d655ad96412965380061302a8e9
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>