Revert "tcmode: disable pseudo when running the toolchain"

This caused all manner of breakage due to the toolchain writing out files
with wrong ownership, then those files would end up leaking into the rootfs.

JIRA: INTAMDDET-129, SB-2725

This reverts commit 6bd4ec919aec8e2007d06dab699c7a8b4deb4136.