flash: Rename write_flash to flash_write

Change-Id: I4b41aac597299c93369d8998b03a7d3e2a128742
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/flash.h b/flash.h
index bd16038..b86ec7d 100644
--- a/flash.h
+++ b/flash.h
@@ -16,7 +16,7 @@
 int flash_set_bytemap(struct mbox_context *context, uint32_t offset,
 		      uint32_t count, uint8_t val);
 int flash_erase(struct mbox_context *context, uint32_t offset, uint32_t count);
-int write_flash(struct mbox_context *context, uint32_t offset, void *buf,
+int flash_write(struct mbox_context *context, uint32_t offset, void *buf,
 		uint32_t count);
 
 #endif /* FLASH_H */