flash: Tidy up coding style for flash functions

Some functions use the wrong code style and generate checkpatch errors.
Fix these.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/flash.h b/include/flash.h
index 2655c72..3bf6b22 100644
--- a/include/flash.h
+++ b/include/flash.h
@@ -84,20 +84,20 @@
 
 /* Prototypes */
 
-extern unsigned long flash_init (void);
-extern void flash_print_info (flash_info_t *);
-extern int flash_erase	(flash_info_t *, int, int);
-extern int flash_sect_erase (ulong addr_first, ulong addr_last);
-extern int flash_sect_protect (int flag, ulong addr_first, ulong addr_last);
-extern int flash_sect_roundb (ulong *addr);
-extern unsigned long flash_sector_size(flash_info_t *info, flash_sect_t sect);
-extern void flash_set_verbose(uint);
+unsigned long flash_init(void);
+void flash_print_info(flash_info_t *info);
+int flash_erase(flash_info_t *info, int s_first, int s_last);
+int flash_sect_erase(ulong addr_first, ulong addr_last);
+int flash_sect_protect(int flag, ulong addr_first, ulong addr_last);
+int flash_sect_roundb(ulong *addr);
+unsigned long flash_sector_size(flash_info_t *info, flash_sect_t sect);
+void flash_set_verbose(uint v);
 
 /* common/flash.c */
-extern void flash_protect (int flag, ulong from, ulong to, flash_info_t *info);
-extern int flash_write (char *, ulong, ulong);
-extern flash_info_t *addr2info (ulong);
-extern int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt);
+void flash_protect(int flag, ulong from, ulong to, flash_info_t *info);
+int flash_write(char *src, ulong addr, ulong cnt);
+flash_info_t *addr2info(ulong addr);
+int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt);
 
 /* drivers/mtd/cfi_mtd.c */
 #ifdef CONFIG_FLASH_CFI_MTD