[PATCH] powerpc: remove do-nothing cpu setup routines

Removed the do-nothing routines __setup_cpu_power3 and
__setup_cpu_power4 and replaced them with a null pointer check
in the caller.  Also removed the Cell processor specific
routine __setup_cpu_be which improperly accessed the
hypervisor page size configuration at SPR HID6.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>