Warning/Error on PASS_THROUGH & (access_bus = READ_WRITE)
Field combination:
type = PASS_THROUGH;
access_bus = READ_WRITE;
access_dev = READ_ONLY;
is not mentioned in the documentation, but is silently digested by
wbgen2 producing only WO/RO code. Maybe warning/error should be issued?
Or it can be consolidated with "SLV/(UN)SIGNED & LOAD_EXT" to one
usecase? Seems to me quite same with just different access rights (whose
can be specified by access_*).