PNPBIOS: remove unused pnpid32_to_pnpid() declaration

All uses of pnpid32_to_pnpid() were removed by
commit 25eb8461 ("PNP: add pnp_eisa_id_to_string()"),
so remove the declaration, too.
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Reviewed-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/pnp/pnpbios/pnpbios.h

@@ -153,7 +153,6 @@ extern int  pnpbios_dont_use_current_config;
 extern int pnpbios_parse_data_stream(struct pnp_dev *dev, struct pnp_bios_node * node);
 extern int pnpbios_read_resources_from_node(struct pnp_dev *dev, struct pnp_bios_node *node);
 extern int pnpbios_write_resources_to_node(struct pnp_dev *dev, struct pnp_bios_node *node);
-extern void pnpid32_to_pnpid(u32 id, char *str);
 
 extern void pnpbios_print_status(const char * module, u16 status);
 extern void pnpbios_calls_init(union pnp_bios_install_struct * header);