PEL: Move PEL section IDs into a header file

These will eventually need to be known to a piece of code that
unflattens a PEL into the appropriate section class objects based on the
section ID field in the PEL data.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I90b9d4be49b2e3807a620745fa663f94f7f4e62c
diff --git a/extensions/openpower-pels/private_header.hpp b/extensions/openpower-pels/private_header.hpp
index 4a8b330..66126a0 100644
--- a/extensions/openpower-pels/private_header.hpp
+++ b/extensions/openpower-pels/private_header.hpp
@@ -14,8 +14,7 @@
     uint8_t version[8];
 };
 
-static constexpr uint16_t privateHeaderSectionID = 0x5048; // 'PH'
-static constexpr uint16_t privateHeaderVersion = 0x01;
+static constexpr uint8_t privateHeaderVersion = 0x01;
 static constexpr uint8_t minSectionCount = 2;
 
 /**