[MIPS] Malta, Atlas, Sead: remove an extern from .c files

This patch moves the "extern" declaration for the function
mips_reboot_setup() from the board setup .c files to the
header file include/asm-mips/mips-boards/generic.h.

This fixes a warning produced by the checkpatch.pl script.

No functional changes introduced.

This was compile-tested by building the kernel for all
three boards affected by this change. All builds finished
successfully.
Signed-off-by: Dmitri Vorobiev <dmitri.vorobiev@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/mips-boards/atlas/atlas_setup.c

@@ -34,8 +34,6 @@
 #include <asm/time.h>
 #include <asm/traps.h>
 
-extern void mips_reboot_setup(void);
-
 #ifdef CONFIG_KGDB
 extern void kgdb_config(void);
 #endif

arch/mips/mips-boards/malta/malta_setup.c

@@ -35,8 +35,6 @@
 #include <linux/console.h>
 #endif
 
-extern void mips_reboot_setup(void);
-
 #ifdef CONFIG_KGDB
 extern void kgdb_config(void);
 #endif

arch/mips/mips-boards/sead/sead_setup.c

@@ -34,8 +34,6 @@
 #include <asm/mips-boards/seadint.h>
 #include <asm/time.h>
 
-extern void mips_reboot_setup(void);
-
 static void __init serial_init(void);
 
 const char *get_system_type(void)

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

@@ -97,6 +97,8 @@ extern int mips_revision_corid;
 
 extern int mips_revision_sconid;
 
+extern void mips_reboot_setup(void);
+
 #ifdef CONFIG_PCI
 extern void mips_pcibios_init(void);
 #else