Suppress userspace undefined instructions logs

On 8x26 CONFIG_DEBUG_USER is enabled by default. This config is printing undefined instruction logs in kernel for userspaces processes causing excessive logging issues.Suppress undefined instruction logs in kernel to avoid excessive logging.

Change-Id: I5f5da1f46a4581451b0c32dc62aeefc728e06459
Signed-off-by: klozz <xxx.reptar.rawrr.xxx@gmail.com>