Replace reference to pm_power_off (which is an implementation detail)
and replace it with a more generic description of the driver's
functionality.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Acked-by: NMark Rutland <mark.rutland@arm.com>
Acked-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NRob Herring <robh@kernel.org>