flash: Rename erase_flash to flash_erase

Change-Id: I417319aadb2fdbfa2d688bb26b5515d2f9265994
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/flash.h b/flash.h
index 7566d4b..bd16038 100644
--- a/flash.h
+++ b/flash.h
@@ -15,7 +15,7 @@
 		   uint32_t size);
 int flash_set_bytemap(struct mbox_context *context, uint32_t offset,
 		      uint32_t count, uint8_t val);
-int erase_flash(struct mbox_context *context, uint32_t offset, uint32_t count);
+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,
 		uint32_t count);