1. The original code has a bug on calculate the size of SCRATCH_SIZE. It should be...

1. The original code has a bug on calculate the size of SCRATCH_SIZE. It should be maximum value between PcdMaxVariableSize and PcdMaxHardwareErrorVariableSize.
2. Boot time variable reclaim issue is caused by incorrect flash layout. Platform integrator should ensure that the size of variable region must less than FTW spare space size.
3. Per UEFI Specification, variables of attribute HARDWARE_ERROR_RECORD are guaranteed to have its own storage space size.original implementation doesn’t meet this requirement

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8029 6f19259b-4bc3-4df7-8a09-765794883524