L430/L530 MFG mode

[Daniel]

During testing for 1vyra.in we have discovered that with L430/L530 UEFI version 2.76(haven't tried others), the TPM MFG mode gets enabled. The hex string 4C 4E 56 42 42 53 45 43 FB gets changed to 4C 4E 56 42 42 53 45 43 FF. This means the TPM is non-functional, while this does bypass the integrity check, it isn't needed as if it's changed back manually it runs like normal with the checksums being fixed.