board-encore: enclose #define expression in parentheses

Change-Id: I47fef2aca7ef0f3bfd38e1a2e3d20e6afecffe0c
Add a new defconfig for CM10.2 builds

For now, this is identical to the CM10.1 defconfig except for the
addition of CONFIG_AUDIT (needed for auditd to start successfully).

Change-Id: Ia6e81c17485f061e1274d64557bf6e379e0494d0