flash: Rename init_flash_dev to flash_dev_init

Change-Id: I6b9a916053baf09c34100dcb5262a4b66a44bc80
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/flash.h b/flash.h
index 5b47769..1c66fc2 100644
--- a/flash.h
+++ b/flash.h
@@ -9,7 +9,7 @@
 
 #include "mbox.h"
 
-int init_flash_dev(struct mbox_context *context);
+int flash_dev_init(struct mbox_context *context);
 void free_flash_dev(struct mbox_context *context);
 int64_t copy_flash(struct mbox_context *context, uint32_t offset, void *mem,
 		   uint32_t size);