of/fdt: consolidate built-in dtb section variables

Unify the various architectures __dtb_start and __dtb_end definitions
moving them into of_fdt.h.

Signed-off-by: Rob Herring <[e-mail]>
Acked-by: Vineet Gupta <[e-mail]>
Acked-by: James Hogan <[e-mail]>
Tested-by: Michal Simek <[e-mail]>
Cc: Ralf Baechle <[e-mail]>
Cc: Jonas Bonn <[e-mail]>
Cc: Chris Zankel <[e-mail]>
Cc: Max Filippov <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Tested-by: Grant Likely <[e-mail]>
Tested-by: Stephen Chivers <[e-mail]>

arch/arc/include/asm/sections.h

···
 #include <asm-generic/sections.h>
 
 extern char __arc_dccm_base[];
-extern char __dtb_start[];
 
 #endif

arch/metag/kernel/setup.c

···
 
 extern char _heap_start[];
 
-#ifdef CONFIG_METAG_BUILTIN_DTB
-extern u32 __dtb_start[];
-#endif
-
 #ifdef CONFIG_DA_CONSOLE
 /* Our early channel based console driver */
 extern struct console dash_console;

arch/mips/include/asm/mips-boards/generic.h

···
 
 extern int mips_revision_sconid;
 
-extern char __dtb_start[];
-
 #ifdef CONFIG_PCI
 extern void mips_pcibios_init(void);
 #else

arch/mips/lantiq/prom.h

···
 extern void ltq_soc_detect(struct ltq_soc_info *i);
 extern void ltq_soc_init(void);
 
-extern char __dtb_start[];
-
 #endif

arch/mips/netlogic/xlp/dt.c

···
 #include <asm/prom.h>
 
 extern u32 __dtb_xlp_evp_begin[], __dtb_xlp_svp_begin[],
-	__dtb_xlp_fvp_begin[], __dtb_xlp_gvp_begin[], __dtb_start[];
+	__dtb_xlp_fvp_begin[], __dtb_xlp_gvp_begin[];
 static void *xlp_fdt_blob;
 
 void __init *xlp_dt_init(void *fdtp)

arch/mips/ralink/of.c

···
 __iomem void *rt_sysc_membase;
 __iomem void *rt_memc_membase;
 
-extern char __dtb_start[];
-
 __iomem void *plat_of_remap_node(const char *node)
 {
 	struct resource res;

arch/openrisc/kernel/vmlinux.h

···
 extern char __initrd_start, __initrd_end;
 #endif
 
-extern u32 __dtb_start[];
-
 #endif

arch/xtensa/kernel/setup.c

···
 #endif
 
 #ifdef CONFIG_OF
-extern u32 __dtb_start[];
 void *dtb_start = __dtb_start;
 #endif
 

include/linux/of_fdt.h

···
 extern int __initdata dt_root_size_cells;
 extern struct boot_param_header *initial_boot_params;
 
+extern char __dtb_start[];
+extern char __dtb_end[];
+
 /* For scanning the flat device-tree at boot time */
 extern char *find_flat_dt_string(u32 offset);
 extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,