target-host-required: Be permissive when ALLOW_MISSING_DEPENDENCY is set

add-all-host-to-target-required-modules-deps and
add-all-target-to-host-required-modules-deps permit errors when
ALLOW_MISSING_DEPENDENCY is set to true.

The previous behavior may break when doing unbundled builds.

Bug: 160318430
Bug: 7456955
Test: TH art-target-arm build pass
Change-Id: I00818d27ce18f4072eff9fa98958be820b5cd1f8
Merged-In: I00818d27ce18f4072eff9fa98958be820b5cd1f8
(cherry picked from commit 2c7c8bb6)