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/user_header.hpp b/extensions/openpower-pels/user_header.hpp
index ae7a922..5e64ff4 100644
--- a/extensions/openpower-pels/user_header.hpp
+++ b/extensions/openpower-pels/user_header.hpp
@@ -8,8 +8,7 @@
 namespace pels
 {
 
-static constexpr uint16_t userHeaderSectionID = 0x5548; // 'UH'
-static constexpr uint16_t userHeaderVersion = 0x01;
+static constexpr uint8_t userHeaderVersion = 0x01;
 
 /**
  * @class UserHeader