edtlib: tests: cover basics of filtering inherited properties

Use-case "B includes I includes X":
- X is a base binding file, specifying common properties
- I is an intermediary binding file, which includes X
  without modification nor filter
- B includes I, filtering the properties it chooses
  to inherit with an allowlist or a blocklist

Check that the properties inherited from X via I
are actually filtered as B intends to,
up to the grandchild-binding level.

Signed-off-by: Christophe Dufaza <chris@openmarl.org>