Submodule update for v0.3.12 (google#310)

Submodule update for v0.3.12 (google#310)

read pcr: Change output format to be more readable

PCR values are usually reffered to with hex values, so this
increases usablity.

Signed-off-by: Joe Richey <[email protected]>

Support more algorithms and package for Arch Linux

Changes:
  - ECC Support (google#49, google#50, google#51, google#62)
  - Sealing/Unsealing support certification (google#55, google#60, google#63)
  - Add TpmSigner (google#56, google#63)
  - New "read pcr" command (google#47)
  - Fix Windows build (google#67)
  - Package for Arch Linux (google#68)
  - Minor CLI bug fixes (google#54, google#66, google#69)
  - Build improvements/fixes (google#58, google#59, google#64, google#65, google#67)

Add server and client Import workflows (google#36)

* Add CreateImportRequest and Import to support server and client Import
workflows.

* Fix error messages and use BitLen function

* fix syntax error

* update go-tpm version

* Make suggested changes

* Make more suggested changes

* replace capitalized error messages with lower case

* modified error messages

* rearrange functions, move key conversion to server package

* fix import and param name

* update key conversion tests

* add missing error check

* make test failure message more descriptive

* Fix imports with goimports

Vendor ms-tpm-20-ref (google#41)

* Remove submodule

* Add vendored files

* Adjust flags to point to new location

* Update documentation and tests

* Update build instructions

* Revert testing change from google#39