Since we use intel_enable_rc6() now for more than just when we're
enabling RC6, we'll see this message many times, and it is just
confusing.

As an example, calc_residency calls this function whenever poked via
sysfs. This leaves the impression in dmesg that we're constantly
re-enabling RC6.

While at it, move the defines and description from drv.h to intel_pm.c,
since these are only ever used in that code.
Signed-off-by: NBen Widawsky <ben@bwidawsk.net>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>