[PATCH 3/3] Add 6xx-style HID0_SLEEP support.

[Paul Mackerras]

Scott Wood writes:

> +_GLOBAL(mpc6xx_enter_sleep)

The name is slightly unfortunate as powerbooks also use 6xx-family
processors but enter sleep in a quite different manner, because they
exit sleep with a reset.  Can you think of a better name, that gives a
hint that this is the one to use if we are exiting sleep with an
interrupt rather than a reset?

Paul.