msm: kgsl: Print a fault banner for "ringbuffer" GPU faults

Sometimes a GPU fault will be triggered by the microcode or
something occurring in the ringbuffer without an associated
command batch to blame.

Print a slightly modified fault message in this case to let
the user know what happened and possibly provide some
information about where the egregiousness occurred.

Change-Id: Ic0dedbadd2a8029ce2d0b4fe43ca487b8e6dc9e7
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>