powerpc/pseries: Move hcall_vphn() prototype into vphn.h

Consolidate the two prototypes for hcall_vphn() into vphn.h.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230823055317.751786-2-mpe@ellerman.id.au

arch/powerpc/include/asm/dtl.h

@@ -39,6 +39,5 @@ extern rwlock_t dtl_access_lock;
 
 extern void register_dtl_buffer(int cpu);
 extern void alloc_dtl_buffers(unsigned long *time_limit);
-extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
 
 #endif /* _ASM_POWERPC_DTL_H */

arch/powerpc/include/asm/lppaca.h

@@ -127,8 +127,6 @@ struct slb_shadow {
 	} save_area[SLB_NUM_BOLTED];
 } ____cacheline_aligned;
 
-extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
-
 #endif /* CONFIG_PPC_BOOK3S */
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_LPPACA_H */

arch/powerpc/include/asm/vphn.h

@@ -19,4 +19,6 @@
 #define VPHN_FLAG_VCPU	1
 #define VPHN_FLAG_PCPU	2
 
+long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
+
 #endif // _ASM_POWERPC_VPHN_H