defconfig: msm8994: enable SMD logging

Internal SMD logging is critical to debug support and has minimal impact
to system performance.

Enable SMD internal debug logging.

CRs-Fixed: 769777
Change-Id: I7ce60c4e92a3fb41558af6da735cc255eea3f866
Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>