test: write_flash_vpnor: Remove unused macro

Change-Id: I635a085283d86a1f672f736a26981901d38ea599
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/test/vpnor/write_flash_vpnor.cpp b/test/vpnor/write_flash_vpnor.cpp
index c53e8da..7c8f506 100644
--- a/test/vpnor/write_flash_vpnor.cpp
+++ b/test/vpnor/write_flash_vpnor.cpp
@@ -45,7 +45,6 @@
 #define OFFSET BLOCK_SIZE
 #define MEM_SIZE (BLOCK_SIZE * 2)
 #define DATA_SIZE sizeof(data)
-#define ERASE_SIZE BLOCK_SIZE
 #define BLOCK_SIZE_SHIFT 12
 
 const std::string toc[] = {