powerpc: Fix CHRP booting - needs a define_machine call

The patch removing _machine and converting platforms over to use
define_machine wasn't complete as far as CHRP was concerned.  This
adds the define_machine call for CHRP and gets it booting again.

Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/chrp/chrp.h

@@ -9,3 +9,4 @@ extern long chrp_time_init(void);
 
 extern void chrp_find_bridges(void);
 extern void chrp_event_scan(unsigned long);
+extern void chrp_pcibios_fixup(void);