pnor_partition_table: Make writeNameAndId() private to namespace

This is part of the ongoing effort to extract parseTocLine() from the
Table class, enabling reuse in setup for test cases.

Change-Id: I676e536e651dff1b27d0e53ecbb96d8e5ae8f025
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/pnor_partition_table.cpp b/pnor_partition_table.cpp
index 64fdfb5..871adbe 100644
--- a/pnor_partition_table.cpp
+++ b/pnor_partition_table.cpp
@@ -143,7 +143,7 @@
     part.data.flags = 0; // flags unused
 }
 
-inline void Table::writeNameAndId(pnor_partition& part, std::string&& name,
+static inline void writeNameAndId(pnor_partition& part, std::string&& name,
                                   const std::string& id)
 {
     name.resize(PARTITION_NAME_MAX);