msm: subsystem_restart: Explicitly log the restart level.

To allow one to determine what the restart level
was at the time of the invocation of a restart
sequence, explicitly log the level in the kernel
log.

While we're here, mention the name of the subsystem
that has crashed before panic'ing.

Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>