xtensa: Remove unused early_read_config_byte() et al declarations

early_read_config_byte() and similar are declared but never defined.
Remove the unused declarations.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Message-Id: <20220121210258.1152803-1-helgaas@kernel.org>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

Author: bjorn-helgaas

arch/xtensa/include/asm/pci-bridge.h

@@ -73,13 +73,4 @@ static inline void pcibios_init_resource(struct resource *res,
 	res->child = NULL;
 }
 
-
-/* These are used for config access before all the PCI probing has been done. */
-int early_read_config_byte(struct pci_controller*, int, int, int, u8*);
-int early_read_config_word(struct pci_controller*, int, int, int, u16*);
-int early_read_config_dword(struct pci_controller*, int, int, int, u32*);
-int early_write_config_byte(struct pci_controller*, int, int, int, u8);
-int early_write_config_word(struct pci_controller*, int, int, int, u16);
-int early_write_config_dword(struct pci_controller*, int, int, int, u32);
-
 #endif	/* _XTENSA_PCI_BRIDGE_H */