objtool: Remove inat-tables.c when make clean

When build objtool on x86, the generated file inat-tables.c is in
arch/x86/lib instead of arch/x86, use the correct dir to remove it
when make clean.

$ cd tools/objtool
$ make
[...]
GEN arch/x86/lib/inat-tables.c
[...]

Signed-off-by: Tiezhu Yang <[e-mail]>
Signed-off-by: Josh Poimboeuf <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

tools/objtool/Makefile

···
 clean:
 	$(call QUIET_CLEAN, objtool) $(RM) $(OBJTOOL)
 	$(Q)find $(OUTPUT) -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
-	$(Q)$(RM) $(OUTPUT)arch/x86/inat-tables.c $(OUTPUT)fixdep
+	$(Q)$(RM) $(OUTPUT)arch/x86/lib/inat-tables.c $(OUTPUT)fixdep
 
 FORCE: