MIPS: Remove unused dt_setup_arch()

Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8928/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/prom.h

@@ -24,13 +24,6 @@ struct boot_param_header;
 extern void __dt_setup_arch(void *bph);
 extern int __dt_register_buses(const char *bus0, const char *bus1);
 
-#define dt_setup_arch(sym)						\
-({									\
-	extern char __dtb_##sym##_begin[];				\
-									\
-	__dt_setup_arch(__dtb_##sym##_begin);				\
-})
-
 #else /* CONFIG_OF */
 static inline void device_tree_init(void) { }
 #endif /* CONFIG_OF */