flash: Rename erase_flash to flash_erase

Change-Id: I417319aadb2fdbfa2d688bb26b5515d2f9265994
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/vpnor/flash.cpp b/vpnor/flash.cpp
index aff74b5..3b928d4 100644
--- a/vpnor/flash.cpp
+++ b/vpnor/flash.cpp
@@ -101,7 +101,7 @@
     return 0;
 }
 
-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)
 {
     // No-op
     return 0;