i2c/powermac: Improve detection of devices from device-tree

i2c/powermac: Improve detection of devices from device-tree

commit 3a3dd0186f619b74e61e6f29dddcaf59af7d3cac upstream.

This patch adds a number of workarounds for broken Apple device-trees
mostly around sound chips. It handles creating the missing audio codec
devices and works around various issues with missing addresses or
missing compatible properties.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Michel Dänzer <michel@daenzer.net>
Cc: Elimar Riesebieter <riesebie@lxtec.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>