Add in code to convert the Default VarStore name to be L"Setup" based on Framework...

Add in code to convert the Default VarStore name to be L"Setup" based on Framework HII's assumption.

VARSTORE ID of 0 for Buffer Storage Type Storage is defined as invalid in UEFI 2.1 HII. VARSTORE ID
0 is the default VarStore ID for storage without explicit declaration in Framework HII 0.92. EDK II UEFI VFR compiler
in compatible mode will assign 0x0001 as UEFI VARSTORE ID to this default storage id in Framework VFR without
VARSTORE declaration.

In addition, the Name of Default VarStore is assumed to be L"Setup" for those storage without explicit VARSTORE declaration in the formset
by Framework HII. EDK II UEFI VFR compiler in compatible mode hard-coded L"Setup" as VARSTORE name.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7040 6f19259b-4bc3-4df7-8a09-765794883524