Reviewer output currently does not include the subsystem
that matched.  Add it.

Miscellanea:

o Add a get_subsystem_name routine to centralize this
Signed-off-by: NJoe Perches <joe@perches.com>
Tested-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Lee Jones <lee.jones@linaro.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>