MIPS: Loongson: clean up the coding style

With the help of script/checkpatch.pl, i have cleaned up the coding
style.

1. remove un-needed header files and tune some comments.
2. remove some un-needed { }

add a new header file loongson.h:

3. move some common header files to loongson.h
4. move some common extern declartions to loongson.h

and this new header file is needed for future loongson2f support.

Signed-off-by: Wu Zhangjin <wuzj@lemote.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/include/asm/mach-lemote/pci.h b/arch/mips/include/asm/mach-lemote/pci.h
index 0307e49..92b2f59 100644
--- a/arch/mips/include/asm/mach-lemote/pci.h
+++ b/arch/mips/include/asm/mach-lemote/pci.h
@@ -19,11 +19,13 @@
  * 02139, USA.
  */
 
-#ifndef _LEMOTE_PCI_H_
-#define _LEMOTE_PCI_H_
+#ifndef __ASM_MACH_LEMOTE_PCI_H_
+#define __ASM_MACH_LEMOTE_PCI_H_
+
+extern struct pci_ops bonito64_pci_ops;
 
 #define LOONGSON2E_PCI_MEM_START	0x14000000UL
 #define LOONGSON2E_PCI_MEM_END		0x1fffffffUL
 #define LOONGSON2E_PCI_IO_START		0x00004000UL
 
-#endif /* !_LEMOTE_PCI_H_ */
+#endif /* !__ASM_MACH_LEMOTE_PCI_H_ */