Now that we filter out PATH to only the utilities we rely upon, the devshel
terminal was broken since it can no longer find the terminals. Even if
we fix that, the user couldn't access any of their commands within
devshell which somewhat defeats its purpose.
Add the original PATH back to the environment to restore that behaviour
since this is more in line with user expectations and it wouldn't be possible
(or desireable) to whitelist all the commands a user might want to use from
the shell.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
