ARC: logging: Print exception info independent of CONFIG_LOG

Some applications turn logging off. It makes impossible to get information
about exceptions if it occures.
This PR restores correct behavior of Error_Dump messages, and
exception dump is printed anyway independent on CONFIG_LOG.

ARC_EXCEPTION_DEBUG added to default boards configs in addition to nsim.

CONFIG_FAULT_DUMP removed from ARC branch as it has been unused
since v1.8.0

Signed-off-by: Nikolay Agishev <agishev@synopsys.com>