Add trusted computing components

This adds software components needed to work with the Trusted Platform Module (TPM) as well as trusted boot, and remote attestation.

tboot - trusted boot
sinit - Intel TXT modules for motherboard bioses where this is not integrated with the BIOS
tpm-quote-tools - Remote attestation tools
rngd - rngd should not touch the TPM
tcsd - The Trusted Computing Group Software Stack (TSS) daemon which interfaces with the TPM