objtool/powerpc: Implement arch_pc_relative_reloc()

Provide an implementation for arch_pc_relative_reloc(). It is needed to
pass the build once 61c6065e ("objtool: Allow !PC relative
relocations") is merged.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

tools/objtool/arch/powerpc/decode.c

@@ -82,6 +82,15 @@ unsigned long arch_jump_destination(struct instruction *insn)
 	return insn->offset + insn->immediate;
 }
 
+bool arch_pc_relative_reloc(struct reloc *reloc)
+{
+	/*
+	 * The powerpc build only allows certain relocation types, see
+	 * relocs_check.sh, and none of those accepted are PC relative.
+	 */
+	return false;
+}
+
 void arch_initial_func_cfi_state(struct cfi_init_state *state)
 {
 	int i;

tools/objtool/include/objtool/arch.h

@@ -95,4 +95,6 @@ bool arch_is_rethunk(struct symbol *sym);
 
 int arch_rewrite_retpolines(struct objtool_file *file);
 
+bool arch_pc_relative_reloc(struct reloc *reloc);
+
 #endif /* _ARCH_H */