flash: Rename free_flash_dev to flash_dev_free

Change-Id: I3d3da6312217b6b869fa3f62a1d4752be98fd609
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/flash.h b/flash.h
index 1c66fc2..a53e76e 100644
--- a/flash.h
+++ b/flash.h
@@ -10,7 +10,7 @@
 #include "mbox.h"
 
 int flash_dev_init(struct mbox_context *context);
-void free_flash_dev(struct mbox_context *context);
+void flash_dev_free(struct mbox_context *context);
 int64_t copy_flash(struct mbox_context *context, uint32_t offset, void *mem,
 		   uint32_t size);
 int set_flash_bytemap(struct mbox_context *context, uint32_t offset,