integrity/policycheck: add the following flags to policycheck:

NOMD5: skip chunk md5 testing (so no data gets downloaded)
FORCE_RAWX_REBUILD: consider unreachable rawx as broken

Change-Id: I613a04134a03a101f79bf661e6156aec22caf92e
Merge "integrity/policycheck: add the following flags to policycheck:"