update function header
delete extern CHAR16 NibbleToHexChar(UINT8 Nibble); and use #include <Library/BaseLib.h>
update struct definition format to pass ECC check
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6964 6f19259b-4bc3-4df7-8a09-765794883524
change the old code style to comply with Doxgen format
[Impaction]
add comments for every function
[Reference Info]
add comments to achieve the highest standard of code quality matrix
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5079 6f19259b-4bc3-4df7-8a09-765794883524