UEFI: add Driver####, DriverOrder and Key#### global variables for uefidump on fwts

Add the global variables, Driver####, DriverOrder and Key#### parser for the uefidump utility on fwts.
1. Add support for DriverOrder - The DriverOrder variable contains an array of UINT16’s that make up an ordered list of the
Driver#### variable.
2. Add support for Driver#### - Each Driver#### variable contains an EFI_LOAD_OPTION. Each load option variable is
appended with a unique number, for example Driver0001, Driver0002, etc.
3. Add support for Key#### - The Key#### variable associates a key press with a single boot option. Each Key#### variable
is the name "Key" appended with a unique four digit hexadecimal number. For example, Key0001,
Key0002, Key00A0, etc.