[dev][tpm] Save state on suspend

Change-Id: I416d7aadc2b72f1b0490535d7438dee265b94bdd

[tpm][mexec] Make TPM relinquish locality before mexec'ing

This allows the driver instance on the post-mexec image to
successfully find to the TPM.

Change-Id: I362ce891a39497f1ca09448afc50dda776986e5f

[dev][tpm] Modernize driver and implement i2c transport

Change-Id: If944b5c85b6d1da9c22a0e7f8485fa51475157d6

[dev][tpm] Rough conversion to C++

Change-Id: I643effc5a6dcbc1bb55a7ffe4c8bb0d512695a9d

[zx] Magenta -> Zircon

The Great Renaming is here!

Change-Id: I3229bdeb2a3d0e40fb4db6fec8ca7d971fbffb94

[dev][tpm] Detect the interface version

This driver was written targeting the Chromebook Pixel 2, which uses a
TPM 1.2. It has not been tested on version 1.3, and the TPM 2.0 spec is
substantially different. Add detection code to early abort on version
mismatch.

Change-Id: Ia6410d4bf7fe942d96f2cffd54113bf82cc87414

[udev][tpm] rename

Change-Id: I6e527eb687a46d2788702c184c04fd62570c7ca7