1. Update Generic BDS part to use dynamic PCD to set console output mode instead...

1. Update Generic BDS part to use dynamic PCD to set console output mode instead of use L"ConOutMode" and gEfiGenericPlatformVariableGuid to set console output mode.
2. Drop the menu item of set Primary Video to PCI or AGP. If some platform wishes to set AGP video option, platform BDS code needs to add this item.
3. Minor update to use Raw String to performance logging

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7575 6f19259b-4bc3-4df7-8a09-765794883524