powerpc/rtas: Move post_mobility_fixup() declaration to pseries

This is a pseries-specific function declaration that doesn't belong in
rtas.h. Move it to the pseries platform code and adjust
pseries/suspend.c accordingly.
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231106-rtas-trivial-v1-5-61847655c51f@linux.ibm.com

arch/powerpc/include/asm/rtas.h

@@ -444,7 +444,6 @@ extern void pSeries_log_error(char *buf, unsigned int err_type, int fatal);
 #ifdef CONFIG_PPC_PSERIES
 extern time64_t last_rtas_event;
 extern int clobbering_unread_rtas_event(void);
-extern void post_mobility_fixup(void);
 int rtas_syscall_dispatch_ibm_suspend_me(u64 handle);
 #else
 static inline int clobbering_unread_rtas_event(void) { return 0; }

arch/powerpc/platforms/pseries/pseries.h

@@ -55,6 +55,7 @@ extern int dlpar_detach_node(struct device_node *);
 extern int dlpar_acquire_drc(u32 drc_index);
 extern int dlpar_release_drc(u32 drc_index);
 extern int dlpar_unisolate_drc(u32 drc_index);
+extern void post_mobility_fixup(void);
 
 void queue_hotplug_event(struct pseries_hp_errorlog *hp_errlog);
 int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_errlog);

arch/powerpc/platforms/pseries/suspend.c

@@ -13,6 +13,7 @@
 #include <asm/mmu.h>
 #include <asm/rtas.h>
 #include <asm/topology.h>
+#include "pseries.h"
 
 static struct device suspend_dev;