Revert "Don't modprobe the TPM modules."
Revert "Don't modprobe the TPM modules."

This reverts commit e343bb6b3715fb99534838589145af26cefe7e1b.

Avoid breaking cryptohomed in VMs.

TBR: gauravsh

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6905062

Change-Id: Ib063d4bcd2e78eada5c8faa5bc498f2ddbbd8025

joshfire/chromiumos-platform-init