Call cros_generate_*update_payload from its actual location.
Call cros_generate_*update_payload from its actual location.

The path chromite used to call cros_generate_update_payload and
cros_generate_stateful_update_payload actually had symlinks to the actual
scripts instead of the scripts themselves. This changes the path to point to
the scripts so the symlinks can be deleted.

BUG=None
TEST=Ran run_tests.

Change-Id: If69ace4e998ccb8cfc982c8d68f50e1d7463de5f
Reviewed-on: https://chromium-review.googlesource.com/209406
Reviewed-by: Don Garrett <546ec366615570e68497e3c5df9092106a9808f4@chromium.org>
Commit-Queue: Gabe Black <5c8aa1266c03186393d9e7b3b4e3b14239af8201@chromium.org>
Tested-by: Gabe Black <5c8aa1266c03186393d9e7b3b4e3b14239af8201@chromium.org>

bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite