twister: update launcher for out-of-chroot builds
twister: update launcher for out-of-chroot builds

Update the default environment configuration so it will account for
running things outside the chroot using the host toolchain.

BRANCH=none
BUG=none
TEST=build and test using twister_launcher outside the chroot

Signed-off-by: Yuval Peress <50dc11c009bd4d7e9d9d15a383c1743ce5ee82ef@google.com>
Change-Id: I29dc9c7cfa7678ee062f078dae222dc9efc70223
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3885396
Commit-Queue: Jeremy Bettis <4df7b5147fee087dca33c181f288ee7dbf56e022@chromium.org>
Reviewed-by: Jeremy Bettis <4df7b5147fee087dca33c181f288ee7dbf56e022@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec