sparc: Use the new common NVRAM functions for system and free space partition

sparc: Use the new common NVRAM functions for system and free space partition

The system and free space NVRAM partitions (for OpenBIOS) are created
in exactly the same way as the Mac-style CHRP NVRAM partitions, so we
can use the new common helper functions to do this job here, too.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>